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Syphilis
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<h2 id="signs-and-symptoms">Signs and symptoms</h2> <p>Syphilis can <a href="/facts/Presentation_(medical)/q7QyS9Ha">present</a> in one of four different stages: primary, secondary, latent, and tertiary, and may also occur <a href="/facts/Congenital/ESfzQhTx">congenitally</a>.<a class="footnote-ref" id="fnref:33" href="#fn:33"><sup>33</sup></a> There may be <a href="/facts/Asymptomatic/6ewHqlEU">no symptoms</a>.<a class="footnote-ref" id="fnref:34" href="#fn:34"><sup>34</sup></a> It was referred to as "the great imitator" by <a href="/facts/Sir_William_Osler/xRwrwyzc">Sir William Osler</a> due to its varied presentations.<a class="footnote-ref" id="fnref:35" href="#fn:35"><sup>35</sup></a><a class="footnote-ref" id="fnref:36" href="#fn:36"><sup>36</sup></a><a class="footnote-ref" id="fnref:37" href="#fn:37"><sup>37</sup></a> </p> <h3>Primary</h3> <p>Primary syphilis is typically acquired by direct sexual contact with the infectious lesions of another person.<a class="footnote-ref" id="fnref:38" href="#fn:38"><sup>38</sup></a> Approximately 2–6 weeks after contact (with a range of 10–90 days) a skin lesion, called a <a href="/facts/Chancre/QQxE4SW2">chancre</a>, appears at the site and this contains infectious bacteria.<a class="footnote-ref" id="fnref:39" href="#fn:39"><sup>39</sup></a><a class="footnote-ref" id="fnref:40" href="#fn:40"><sup>40</sup></a> This is classically (40% of the time) a single, firm, painless, non-itchy <a href="/facts/Skin_ulceration/EpyxNx6b">skin ulceration</a> with a clean base and sharp borders approximately 0.3–3.0 cm in size.<a class="footnote-ref" id="fnref:41" href="#fn:41"><sup>41</sup></a> The lesion may take on almost any form.<a class="footnote-ref" id="fnref:42" href="#fn:42"><sup>42</sup></a> In the classic form, it evolves from a <a href="/facts/Macule/Vkr5XpeG">macule</a> to a <a href="/facts/Papule/2J7QwJdE">papule</a> and finally to an <a href="/facts/Erosion_(dermatopathology)/Vkr5XpeG">erosion</a> or <a href="/facts/Ulcer_(dermatology)/ALY0IW1n">ulcer</a>.<a class="footnote-ref" id="fnref:43" href="#fn:43"><sup>43</sup></a> Occasionally, multiple lesions may be present (~40%),<a class="footnote-ref" id="fnref:44" href="#fn:44"><sup>44</sup></a> with multiple lesions being more common when coinfected with HIV.<a class="footnote-ref" id="fnref:45" href="#fn:45"><sup>45</sup></a> Lesions may be painful or tender (30%), and they may occur in places other than the genitals (2–7%).<a class="footnote-ref" id="fnref:46" href="#fn:46"><sup>46</sup></a> The most common location in women is the <a href="/facts/Cervix/qw3gl8Pq">cervix</a> (44%), the <a href="/facts/Human_penis/shzvo9ML">penis</a> in heterosexual men (99%), and <a href="/facts/Human_anus/PGkvVMYT">anally</a> and <a href="/facts/Rectal/caqqyk2e">rectally</a> in <a href="/facts/Men_who_have_sex_with_men/F2gI6FQG">men who have sex with men</a> (34%).<a class="footnote-ref" id="fnref:47" href="#fn:47"><sup>47</sup></a> <a href="/facts/Lymphadenopathy/t7t4tEon">Lymph node enlargement</a> frequently (80%) occurs around the area of infection,<a class="footnote-ref" id="fnref:48" href="#fn:48"><sup>48</sup></a> occurring seven to 10 days after chancre formation.<a class="footnote-ref" id="fnref:49" href="#fn:49"><sup>49</sup></a> The <a href="/facts/Lesion/WJDFnyLk">lesion</a> may persist for three to six weeks if left untreated.<a class="footnote-ref" id="fnref:50" href="#fn:50"><sup>50</sup></a> </p> <h3>Secondary</h3> <p>Secondary syphilis occurs approximately four to ten weeks after the primary infection.<a class="footnote-ref" id="fnref:51" href="#fn:51"><sup>51</sup></a> While secondary disease is known for the many different ways it can manifest, symptoms most commonly involve the <a href="/facts/Human_skin/cfRXQwSs">skin</a>, <a href="/facts/Mucous_membranes/oIw0vyel">mucous membranes</a>, and <a href="/facts/Lymph_nodes/vkwfcQjH">lymph nodes</a>.<a class="footnote-ref" id="fnref:52" href="#fn:52"><sup>52</sup></a> There may be a symmetrical, reddish-pink, non-itchy <a href="/facts/Rash/W97qGpq6">rash</a> on the trunk and extremities, including the palms and soles.<a class="footnote-ref" id="fnref:53" href="#fn:53"><sup>53</sup></a><a class="footnote-ref" id="fnref:54" href="#fn:54"><sup>54</sup></a> The rash may become <a href="/facts/Maculopapular/YAIQGkbB">maculopapular</a> or <a href="/facts/Abscess/BW3TH8kb">pustular</a>.<a class="footnote-ref" id="fnref:55" href="#fn:55"><sup>55</sup></a> It may form flat, broad, whitish, wart-like lesions on mucous membranes, known as <a href="/facts/Condyloma_latum/L7atuVS7">condyloma latum</a>.<a class="footnote-ref" id="fnref:56" href="#fn:56"><sup>56</sup></a> All of these lesions harbor bacteria and are infectious.<a class="footnote-ref" id="fnref:57" href="#fn:57"><sup>57</sup></a> Other symptoms may include <a href="/facts/Fever/waVxR2Ac">fever</a>, <a href="/facts/Sore_throat/00WHEyla">sore throat</a>, <a href="/facts/Malaise/vdb5DxAU">malaise</a>, <a href="/facts/Weight_loss/DQE4cXw0">weight loss</a>, <a href="/facts/Hair_loss/uEPKUafl">hair loss</a>, and <a href="/facts/Headache/mdmmC9DP">headache</a>.<a class="footnote-ref" id="fnref:58" href="#fn:58"><sup>58</sup></a> Rare manifestations include <a href="/facts/Hepatitis/FIN87T5e">liver inflammation</a>, <a href="/facts/Kidney/HBspPrv9">kidney</a> disease, <a href="/facts/Arthritis/IQ1wyf21">joint inflammation</a>, <a href="/facts/Periostitis/NgSslqK8">periostitis</a>, <a href="/facts/Optic_neuritis/Nhj3r878">inflammation of the optic nerve</a>, <a href="/facts/Uveitis/le0Ns1eE">uveitis</a>, and <a href="/facts/Interstitial_keratitis/FI7lJBLv">interstitial keratitis</a>.<a class="footnote-ref" id="fnref:59" href="#fn:59"><sup>59</sup></a><a class="footnote-ref" id="fnref:60" href="#fn:60"><sup>60</sup></a> The acute symptoms usually resolve after three to six weeks;<a class="footnote-ref" id="fnref:61" href="#fn:61"><sup>61</sup></a> about 25% of people may present with a recurrence of secondary symptoms.<a class="footnote-ref" id="fnref:62" href="#fn:62"><sup>62</sup></a><a class="footnote-ref" id="fnref:63" href="#fn:63"><sup>63</sup></a> Many people who present with secondary syphilis (40–85% of women, 20–65% of men) do not report previously having had the classical chancre of primary syphilis.<a class="footnote-ref" id="fnref:64" href="#fn:64"><sup>64</sup></a> </p> <h3>Latent</h3> <p>Latent syphilis is defined as having <a href="/facts/Serology/wmNg447o">serologic</a> proof of infection without symptoms of disease.<a class="footnote-ref" id="fnref:65" href="#fn:65"><sup>65</sup></a> It develops after secondary syphilis and is divided into early latent and late latent stages.<a class="footnote-ref" id="fnref:66" href="#fn:66"><sup>66</sup></a> Early latent syphilis is defined by the <a href="/facts/World_Health_Organization/YNN3bgug">World Health Organization</a> as less than 2 years after original infection.<a class="footnote-ref" id="fnref:67" href="#fn:67"><sup>67</sup></a> Early latent syphilis is infectious as up to 25% of people can develop a recurrent secondary infection (during which bacteria are actively replicating and are infectious).<a class="footnote-ref" id="fnref:68" href="#fn:68"><sup>68</sup></a> Two years after the original infection the person will enter late latent syphilis and is not as infectious as the early phase.<a class="footnote-ref" id="fnref:69" href="#fn:69"><sup>69</sup></a><a class="footnote-ref" id="fnref:70" href="#fn:70"><sup>70</sup></a> The latent phase of syphilis can last many years after which, without treatment, approximately 15–40% of people can develop tertiary syphilis.<a class="footnote-ref" id="fnref:71" href="#fn:71"><sup>71</sup></a> </p> <h3>Tertiary</h3> <p>Tertiary syphilis may occur approximately 3 to 15 years after the initial infection and may be divided into three different forms: gummatous syphilis (15%), late <a href="/facts/Neurosyphilis/RyqWG559">neurosyphilis</a> (6.5%), and cardiovascular syphilis (10%).<a class="footnote-ref" id="fnref:72" href="#fn:72"><sup>72</sup></a><a class="footnote-ref" id="fnref:73" href="#fn:73"><sup>73</sup></a> Without treatment, a third of infected people develop tertiary disease.<a class="footnote-ref" id="fnref:74" href="#fn:74"><sup>74</sup></a> People with tertiary syphilis are not infectious.<a class="footnote-ref" id="fnref:75" href="#fn:75"><sup>75</sup></a> </p><p>Gummatous syphilis or late <a href="/facts/Benignity/Xu5F9mRh">benign</a> syphilis usually occurs 1 to 46 years after the initial infection, with an average of 15 years.<a class="footnote-ref" id="fnref:76" href="#fn:76"><sup>76</sup></a> This stage is characterized by the formation of chronic <a href="/facts/Gumma_(pathology)/UMuCsPBS">gummas</a>, which are soft, tumor-like balls of inflammation which may vary considerably in size.<a class="footnote-ref" id="fnref:77" href="#fn:77"><sup>77</sup></a> They typically affect the skin, bone, and liver, but can occur anywhere.<a class="footnote-ref" id="fnref:78" href="#fn:78"><sup>78</sup></a> </p><p>Cardiovascular syphilis usually occurs 10–30 years after the initial infection.<a class="footnote-ref" id="fnref:79" href="#fn:79"><sup>79</sup></a> The most common complication is <a href="/facts/Syphilitic_aortitis/9VfjEVYJ">syphilitic aortitis</a>, which may result in <a href="/facts/Aortic_aneurysm/8HxHLCG5">aortic aneurysm</a> formation.<a class="footnote-ref" id="fnref:80" href="#fn:80"><sup>80</sup></a> </p><p><a href="/facts/Neurosyphilis/RyqWG559">Neurosyphilis</a> refers to an infection involving the <a href="/facts/Central_nervous_system/k8I6To97">central nervous system</a>. Involvement of the central nervous system in syphilis (either asymptomatic or symptomatic) can occur at any stage of the infection.<a class="footnote-ref" id="fnref:81" href="#fn:81"><sup>81</sup></a> It may occur early, being either asymptomatic or in the form of <a href="/facts/Meningeal_syphilis/gWN2lXgb">syphilitic meningitis</a>; or late as meningovascular syphilis, manifesting as <a href="/facts/General_paresis/13JmXKbz">general paresis</a> or <a href="/facts/Tabes_dorsalis/P8yYXsvA">tabes dorsalis</a>.<a class="footnote-ref" id="fnref:82" href="#fn:82"><sup>82</sup></a> </p><p>Meningovascular syphilis involves inflammation of the small and medium arteries of the central nervous system. It can present between 1–10 years after the initial infection. Meningovascular syphilis is characterized by stroke, cranial nerve palsies and <a href="/facts/Myelopathy/MtyTxXTw">spinal cord inflammation</a>.<a class="footnote-ref" id="fnref:83" href="#fn:83"><sup>83</sup></a> Late symptomatic neurosyphilis can develop decades after the original infection and includes 2 types; general paresis and tabes dorsalis. General paresis presents with dementia, personality changes, delusions, seizures, psychosis and depression.<a class="footnote-ref" id="fnref:84" href="#fn:84"><sup>84</sup></a> Tabes dorsalis is characterized by gait instability, sharp pains in the trunk and limbs, impaired positional sensation of the limbs as well as having a positive <a href="/facts/Romberg%27s_sign/W91vxaam">Romberg's sign</a>.<a class="footnote-ref" id="fnref:85" href="#fn:85"><sup>85</sup></a> Both tabes dorsalis and general paresis may present with <a href="/facts/Argyll_Robertson_pupil/jllyNW8U">Argyll Robertson pupil</a> which are pupils that constrict when the person focuses on near objects (<a href="/facts/Accommodation_reflex/DULcoyog">accommodation reflex</a>) but do not constrict when exposed to bright light (<a href="/facts/Light_reflex/RCCa8TWo">pupillary reflex</a>). </p> <h3>Congenital</h3> <p class="note">Main article: <a href="/facts/Congenital_syphilis/5oCKt60X">Congenital syphilis</a></p> <p>Congenital syphilis is that which is transmitted during pregnancy or during birth.<a class="footnote-ref" id="fnref:86" href="#fn:86"><sup>86</sup></a> Two-thirds of syphilitic infants are born without symptoms.<a class="footnote-ref" id="fnref:87" href="#fn:87"><sup>87</sup></a> Common symptoms that develop over the first couple of years of life include <a href="/facts/Hepatosplenomegaly/mpVCuqgk">enlargement of the liver and spleen</a> (70%), rash (70%), fever (40%), neurosyphilis (20%), and <a href="/facts/Pneumonitis/Ls2TBRA7">lung inflammation</a> (20%).<a class="footnote-ref" id="fnref:88" href="#fn:88"><sup>88</sup></a> If untreated, <a href="/facts/Late_congenital_syphilis/5oCKt60X">late congenital syphilis</a> may occur in 40%, including <a href="/facts/Saddle_nose/4SVB8NS4">saddle nose</a> deformation, <a href="/facts/Higoum%C3%A9nakis%27_sign/VPpax88g">Higouménakis' sign</a>, <a href="/facts/Saber_shin/LQBq12oQ">saber shin</a>, or <a href="/facts/Clutton%27s_joints/qILY0GGV">Clutton's joints</a> among others.<a class="footnote-ref" id="fnref:89" href="#fn:89"><sup>89</sup></a> Infection during pregnancy is also associated with <a href="/facts/Miscarriage/sFq0vdnU">miscarriage</a>.<a class="footnote-ref" id="fnref:90" href="#fn:90"><sup>90</sup></a> The main dental defects seen in congenital syphilis are the peg-shaped, notched incisors known as <a href="/facts/Hutchinson%27s_teeth/AvJUEAWW">Hutchinson's teeth</a> and so-called <a href="/facts/Mulberry_molars/brBwK2Um">mulberry molars</a> (also known as Moon or Fournier molars), defective permanent molars with rounded, deformed crowns resembling a <a href="/facts/Mulberry/F2Kr7Lr5">mulberry</a>.<a class="footnote-ref" id="fnref:91" href="#fn:91"><sup>91</sup></a> </p> <h2 id="cause">Cause</h2> <h3>Bacteriology</h3> <p class="note">Main article: <a href="/facts/Treponema_pallidum/33nBmQTg"><i>Treponema pallidum</i></a></p> <p><i>Treponema pallidum</i> subspecies <i>pallidum</i> is a spiral-shaped, <a href="/facts/Gram-negative/S1PbVtp4">Gram-negative</a>, highly mobile bacterium.<a class="footnote-ref" id="fnref:92" href="#fn:92"><sup>92</sup></a><a class="footnote-ref" id="fnref:93" href="#fn:93"><sup>93</sup></a> Two other human diseases are caused by related <i>Treponema pallidum</i> subspecies, <a href="/facts/Yaws/obmknqrq">yaws</a> (subspecies <i>pertenue</i>) and <a href="/facts/Nonvenereal_endemic_syphilis/rh0HY3qX">bejel</a> (subspecies <i>endemicum</i>), and one further caused by the very closely related <i>Treponema carateum</i>, <a href="/facts/Pinta_(disease)/ctdsKPcB">pinta</a>.<a class="footnote-ref" id="fnref:94" href="#fn:94"><sup>94</sup></a><a class="footnote-ref" id="fnref:95" href="#fn:95"><sup>95</sup></a> Unlike subspecies <i>pallidum</i>, they do not cause neurological disease.<a class="footnote-ref" id="fnref:96" href="#fn:96"><sup>96</sup></a> Humans are the only known <a href="/facts/Natural_reservoir/R9nyLwD4">natural reservoir</a> for subspecies <i>pallidum</i>.<a class="footnote-ref" id="fnref:97" href="#fn:97"><sup>97</sup></a> It is unable to survive more than a few days without a <a href="/facts/Host_(biology)/L6mop0kh">host</a>.<a class="footnote-ref" id="fnref:98" href="#fn:98"><sup>98</sup></a> This is due to its small genome (1.14<a href="/facts/Base_pair/xmPpPQ9W">Mbp</a>) failing to encode the metabolic pathways necessary to make most of its macronutrients.<a class="footnote-ref" id="fnref:99" href="#fn:99"><sup>99</sup></a> It has a slow <a href="/facts/Doubling_time/ADDhE5ak">doubling time</a> of greater than 30 hours.<a class="footnote-ref" id="fnref:100" href="#fn:100"><sup>100</sup></a> The bacterium is known for its ability to evade the immune system and its invasiveness.<a class="footnote-ref" id="fnref:101" href="#fn:101"><sup>101</sup></a> </p> <h3>Transmission</h3> <p>Syphilis is transmitted primarily by sexual contact or during <a href="/facts/Pregnancy/vEKYGpep">pregnancy</a> from a mother to her baby; the bacterium is able to pass through intact mucous membranes or compromised skin.<a class="footnote-ref" id="fnref:102" href="#fn:102"><sup>102</sup></a><a class="footnote-ref" id="fnref:103" href="#fn:103"><sup>103</sup></a> It is thus transmissible by <a href="/facts/Kissing/GQMr9BEr">kissing</a> near a lesion, as well as <a href="/facts/Non-penetrative_sex/8b9vrVxy">manual</a>, <a href="/facts/Oral_sex/QG6XzNkY">oral</a>, <a href="/facts/Vaginal_sex/okjwpVnB">vaginal</a>, and <a href="/facts/Anal_sex/sWRpk95W">anal sex</a>.<a class="footnote-ref" id="fnref:104" href="#fn:104"><sup>104</sup></a><a class="footnote-ref" id="fnref:105" href="#fn:105"><sup>105</sup></a><a class="footnote-ref" id="fnref:106" href="#fn:106"><sup>106</sup></a> Approximately 30% to 60% of those exposed to primary or secondary syphilis will get the disease.<a class="footnote-ref" id="fnref:107" href="#fn:107"><sup>107</sup></a> Its <a href="/facts/Infectivity/LPzgptfl">infectivity</a> is exemplified by the fact that an individual <a href="/facts/Inoculation/M2LPGM66">inoculated</a> with only 57 organisms has a 50% chance of being infected.<a class="footnote-ref" id="fnref:108" href="#fn:108"><sup>108</sup></a> Most new cases in the United States (60%) occur in men who have sex with men; and in this population 20% of syphilis cases were due to oral sex alone.<a class="footnote-ref" id="fnref:109" href="#fn:109"><sup>109</sup></a><a class="footnote-ref" id="fnref:110" href="#fn:110"><sup>110</sup></a> Syphilis can be transmitted by <a href="/facts/Blood_product/2cNt9NmB">blood products</a>, but the risk is low due to screening of <a href="/facts/Blood_donation/PIvGgUSW">donated blood</a> in many countries.<a class="footnote-ref" id="fnref:111" href="#fn:111"><sup>111</sup></a> The risk of transmission from <a href="/facts/Sharing_needles/7UDIyVhC">sharing needles</a> appears to be limited.<a class="footnote-ref" id="fnref:112" href="#fn:112"><sup>112</sup></a> </p><p>It is not generally possible to contract syphilis through toilet seats, daily activities, hot tubs, or sharing eating utensils or clothing.<a class="footnote-ref" id="fnref:113" href="#fn:113"><sup>113</sup></a> This is mainly because the bacteria die very quickly outside of the body, making transmission by <a href="/facts/Fomite/0sTjFaIR">objects</a> extremely difficult.<a class="footnote-ref" id="fnref:114" href="#fn:114"><sup>114</sup></a> </p> <h2 id="diagnosis">Diagnosis</h2> <p>Syphilis is difficult to diagnose clinically during early infection.<a class="footnote-ref" id="fnref:115" href="#fn:115"><sup>115</sup></a> Confirmation is either via <a href="/facts/Blood_tests/zevsf3rC">blood tests</a> or direct visual inspection using <a href="/facts/Dark-field_microscopy/Swz0KbFj">dark field microscopy</a>.<a class="footnote-ref" id="fnref:116" href="#fn:116"><sup>116</sup></a><a class="footnote-ref" id="fnref:117" href="#fn:117"><sup>117</sup></a> Blood tests are more commonly used, as they are easier to perform.<a class="footnote-ref" id="fnref:118" href="#fn:118"><sup>118</sup></a> Diagnostic tests are unable to distinguish between the stages of the disease.<a class="footnote-ref" id="fnref:119" href="#fn:119"><sup>119</sup></a> </p> <h3>Blood tests</h3> <p>Blood tests are divided into <a href="/facts/Nontreponemal_tests_for_syphilis/2t6jWEFt">nontreponemal</a> and treponemal tests.<a class="footnote-ref" id="fnref:120" href="#fn:120"><sup>120</sup></a> </p><p>Nontreponemal tests are used initially and include <a href="/facts/Venereal_disease_research_laboratory/QwNc4Abv">venereal disease research laboratory</a> (VDRL) and <a href="/facts/Rapid_plasma_reagin/kgKgtFfd">rapid plasma reagin</a> (RPR) tests. <a href="/facts/False_positive/jkC44hML">False positives</a> on the nontreponemal tests can occur with some viral infections, such as <a href="/facts/Varicella/XkGzx2GE">varicella</a> (chickenpox) and <a href="/facts/Measles/tepQCUIG">measles</a>. False positives can also occur with <a href="/facts/Lymphoma/418wcMEl">lymphoma</a>, <a href="/facts/Tuberculosis/ggPyovAl">tuberculosis</a>, <a href="/facts/Malaria/rN3g58CX">malaria</a>, <a href="/facts/Endocarditis/SlaH14C3">endocarditis</a>, <a href="/facts/Connective_tissue_disease/ST6bwhxb">connective tissue disease</a>, and <a href="/facts/Pregnancy/vEKYGpep">pregnancy</a>.<a class="footnote-ref" id="fnref:121" href="#fn:121"><sup>121</sup></a> </p><p>Because of the possibility of false positives with nontreponemal tests, confirmation is required with a treponemal test, such as <a href="/facts/Treponema_pallidum_particle_agglutination_assay/m9aplXqp"><i>Treponema pallidum</i> particle agglutination assay</a> (TPHA) or <a href="/facts/Fluorescent_treponemal_antibody_absorption_test/SYhvM6VA">fluorescent treponemal antibody absorption test</a> (FTA-Abs).<a class="footnote-ref" id="fnref:122" href="#fn:122"><sup>122</sup></a> Treponemal antibody tests usually become positive two to five weeks after the initial infection<a class="footnote-ref" id="fnref:123" href="#fn:123"><sup>123</sup></a> and remain positive for many years.<a class="footnote-ref" id="fnref:124" href="#fn:124"><sup>124</sup></a> Neurosyphilis is diagnosed by finding high numbers of <a href="/facts/Leukocytes/vsDunUK0">leukocytes</a> (predominately <a href="/facts/Lymphocytes/pS2pv2Ma">lymphocytes</a>) and high protein levels in the <a href="/facts/Cerebrospinal_fluid/tcWG7hhv">cerebrospinal fluid</a> in the setting of a known syphilis infection.<a class="footnote-ref" id="fnref:125" href="#fn:125"><sup>125</sup></a><a class="footnote-ref" id="fnref:126" href="#fn:126"><sup>126</sup></a> </p> <h3>Direct testing</h3> <p><a href="/facts/Dark_field_microscopy/Swz0KbFj">Dark field microscopy</a> of <a href="/facts/Serous_fluid/LLgNVbvp">serous fluid</a> from a chancre may be used to make an immediate diagnosis.<a class="footnote-ref" id="fnref:127" href="#fn:127"><sup>127</sup></a> Hospitals do not always have equipment or experienced staff members, and testing must be done within 10 minutes of acquiring the sample.<a class="footnote-ref" id="fnref:128" href="#fn:128"><sup>128</sup></a> Two other tests can be carried out on a sample from the chancre: <a href="/facts/Direct_fluorescent_antibody/6hM3zYax">direct fluorescent antibody</a> (DFA) and <a href="/facts/Polymerase_chain_reaction/G0jWzJy1">polymerase chain reaction</a> (PCR) tests.<a class="footnote-ref" id="fnref:129" href="#fn:129"><sup>129</sup></a> DFA uses <a href="/facts/Antibodies/MX8pdTdP">antibodies</a> tagged with <a href="/facts/Fluorescein/8E4xH5at">fluorescein</a>, which attach to specific syphilis proteins, while PCR uses techniques to detect the presence of specific syphilis <a href="/facts/Gene/e1swwPY6">genes</a>.<a class="footnote-ref" id="fnref:130" href="#fn:130"><sup>130</sup></a> These tests are not as time-sensitive, as they do not require living bacteria to make the diagnosis.<a class="footnote-ref" id="fnref:131" href="#fn:131"><sup>131</sup></a> </p> <h2 id="prevention">Prevention</h2> <h3>Vaccine</h3> <p>As of 2018<a href="https://en.wikipedia.org/w/index.php?title=Syphilis&action=edit">[update]</a>, there is no <a href="/facts/Vaccine/QcXzLug2">vaccine</a> effective for prevention.<a class="footnote-ref" id="fnref:132" href="#fn:132"><sup>132</sup></a> Several vaccines based on treponemal proteins reduce lesion development in an <a href="/facts/Animal_model/xPBrtWUX">animal model</a> but research continues.<a class="footnote-ref" id="fnref:133" href="#fn:133"><sup>133</sup></a><a class="footnote-ref" id="fnref:134" href="#fn:134"><sup>134</sup></a> </p> <h3>Sex</h3> <p><a href="/facts/Condom/A39P32AV">Condom</a> use reduces the likelihood of transmission during sex, but does not eliminate the risk.<a class="footnote-ref" id="fnref:135" href="#fn:135"><sup>135</sup></a> The <a href="/facts/Centers_for_Disease_Control_and_Prevention/NmoJNDV5">Centers for Disease Control and Prevention</a> (CDC) states, "Correct and consistent use of latex condoms can reduce the risk of syphilis only when the infected area or site of potential exposure is protected.<a class="footnote-ref" id="fnref:136" href="#fn:136"><sup>136</sup></a> However, a syphilis sore outside of the area covered by a latex condom can still allow transmission, so caution should be exercised even when using a condom."<a class="footnote-ref" id="fnref:137" href="#fn:137"><sup>137</sup></a> </p><p><a href="/facts/Abstinence/FXf52jVY">Abstinence</a> from intimate physical contact with an infected person is effective at reducing the transmission of syphilis. The CDC states, "The surest way to avoid transmission of sexually transmitted diseases, including syphilis, is to abstain from sexual contact or to be in a long-term mutually <a href="/facts/Monogamous/o0REFnev">monogamous</a> relationship with a partner who has been tested and is known to be uninfected."<a class="footnote-ref" id="fnref:138" href="#fn:138"><sup>138</sup></a> </p> <h3>Congenital disease</h3> <p>Congenital syphilis in the newborn can be prevented by screening mothers during early pregnancy and treating those who are infected.<a class="footnote-ref" id="fnref:139" href="#fn:139"><sup>139</sup></a> The <a href="/facts/United_States_Preventive_Services_Task_Force/SLTKvauE">United States Preventive Services Task Force</a> (USPSTF) strongly recommends universal screening of all pregnant women,<a class="footnote-ref" id="fnref:140" href="#fn:140"><sup>140</sup></a> while the <a href="/facts/World_Health_Organization/YNN3bgug">World Health Organization</a> (WHO) recommends all women be tested at their first antenatal visit and again in the <a href="/facts/Third_trimester/vEKYGpep">third trimester</a>.<a class="footnote-ref" id="fnref:141" href="#fn:141"><sup>141</sup></a><a class="footnote-ref" id="fnref:142" href="#fn:142"><sup>142</sup></a> If they are positive, it is recommended their partners also be treated.<a class="footnote-ref" id="fnref:143" href="#fn:143"><sup>143</sup></a> Congenital syphilis is still common in the developing world, as many women do not receive <a href="/facts/Antenatal_care/lkU0EbyX">antenatal care</a> at all, and the antenatal care others receive does not include screening.<a class="footnote-ref" id="fnref:144" href="#fn:144"><sup>144</sup></a><a class="footnote-ref" id="fnref:145" href="#fn:145"><sup>145</sup></a> It still occasionally occurs in the developed world, as those most likely to acquire syphilis are least likely to receive care during pregnancy.<a class="footnote-ref" id="fnref:146" href="#fn:146"><sup>146</sup></a> Several measures to increase access to testing appear effective at reducing rates of congenital syphilis in low- to middle-income countries.<a class="footnote-ref" id="fnref:147" href="#fn:147"><sup>147</sup></a> <a href="/facts/Point-of-care_testing/llrrlXHb">Point-of-care testing</a> to detect syphilis appeared to be reliable, although more research is needed to assess its effectiveness and into improving outcomes in mothers and babies.<a class="footnote-ref" id="fnref:148" href="#fn:148"><sup>148</sup></a> </p> <h3>Screening</h3> <p>The CDC recommends that sexually active men who have sex with men be tested at least yearly.<a class="footnote-ref" id="fnref:149" href="#fn:149"><sup>149</sup></a> The USPSTF also recommends screening among those at high risk.<a class="footnote-ref" id="fnref:150" href="#fn:150"><sup>150</sup></a> </p><p>Syphilis is a <a href="/facts/Notifiable_disease/K3nXSgkE">notifiable disease</a> in many countries, including Canada,<a class="footnote-ref" id="fnref:151" href="#fn:151"><sup>151</sup></a> the <a href="/facts/European_Union/6GYcR8qM">European Union</a>,<a class="footnote-ref" id="fnref:152" href="#fn:152"><sup>152</sup></a> and the United States.<a class="footnote-ref" id="fnref:153" href="#fn:153"><sup>153</sup></a> This means health care providers are required to notify <a href="/facts/Public_health/4563Kre9">public health</a> authorities, which will then ideally provide <a href="/facts/Partner_notification/CVyKVVCx">partner notification</a> to the person's partners.<a class="footnote-ref" id="fnref:154" href="#fn:154"><sup>154</sup></a> Physicians may also encourage patients to send their partners to seek care.<a class="footnote-ref" id="fnref:155" href="#fn:155"><sup>155</sup></a> Several strategies have been found to improve follow-up for STI testing, including email and text messaging of reminders for appointments.<a class="footnote-ref" id="fnref:156" href="#fn:156"><sup>156</sup></a> </p> <h2 id="treatment">Treatment</h2> <h3>Historic use of mercury</h3> <p>As a form of <a href="/facts/Chemotherapy/fWTLbaUT">chemotherapy</a>, elemental mercury had been used to treat skin diseases in Europe as early as 1363.<a class="footnote-ref" id="fnref:157" href="#fn:157"><sup>157</sup></a> As syphilis spread, preparations of mercury were among the first medicines used to combat it. Mercury is in fact highly anti-microbial: by the 16th century it was sometimes found to be sufficient to halt development of the disease when applied to ulcers as an inunction or when inhaled as a suffumigation. It was also treated by ingestion of mercury compounds.<a class="footnote-ref" id="fnref:158" href="#fn:158"><sup>158</sup></a> Once the disease had gained a strong foothold, however, the amounts and forms of mercury necessary to control its development exceeded the human body's ability to tolerate it, and the treatment became worse and more lethal than the disease. Nevertheless, medically directed <a href="/facts/Mercury_poisoning/xdSGkWLU">mercury poisoning</a> became widespread through the 17th, 18th, and 19th centuries in Europe, North America, and India.<a class="footnote-ref" id="fnref:159" href="#fn:159"><sup>159</sup></a> Mercury salts such as <a href="/facts/Mercury_(II)_chloride/aUAKsq6a">mercury (II) chloride</a> were still in prominent medical use as late as 1916, and considered effective and worthwhile treatments.<a class="footnote-ref" id="fnref:160" href="#fn:160"><sup>160</sup></a> </p> <h3>Early infections</h3> <p>The first-line treatment for uncomplicated syphilis (primary or secondary stages) remains a single dose of <a href="/facts/Intramuscular_injection/PPNwW2wB">intramuscular</a> <a href="/facts/Benzathine_benzylpenicillin/mTCIxmn0">benzathine benzylpenicillin</a>.<a class="footnote-ref" id="fnref:161" href="#fn:161"><sup>161</sup></a> The bacterium is highly vulnerable to penicillin when treated early, and a treated individual is typically rendered non-infective in about 24 hours.<a class="footnote-ref" id="fnref:162" href="#fn:162"><sup>162</sup></a> <a href="/facts/Doxycycline/A8DBTzNh">Doxycycline</a> and <a href="/facts/Tetracycline/DQ0exP62">tetracycline</a> are alternative choices for those allergic to penicillin; due to the risk of <a href="/facts/Birth_defect/ESfzQhTx">birth defects</a>, these are not recommended for pregnant women.<a class="footnote-ref" id="fnref:163" href="#fn:163"><sup>163</sup></a> <a href="/facts/Antibiotic_resistance/jsbAywgx">Resistance</a> to <a href="/facts/Macrolide/21qIKr7a">macrolides</a>, <a href="/facts/Rifampicin/9naa8C5l">rifampicin</a>, and <a href="/facts/Clindamycin/n01yIK1x">clindamycin</a> is often present.<a class="footnote-ref" id="fnref:164" href="#fn:164"><sup>164</sup></a> <a href="/facts/Ceftriaxone/9NpBWG12">Ceftriaxone</a>, a third-generation <a href="/facts/Cephalosporin/WeB7I75T">cephalosporin</a> <a href="/facts/Antibiotic/sF1kIfxg">antibiotic</a>, may be as effective as penicillin-based treatment.<a class="footnote-ref" id="fnref:165" href="#fn:165"><sup>165</sup></a> It is recommended that a treated person avoid sex until the sores are healed.<a class="footnote-ref" id="fnref:166" href="#fn:166"><sup>166</sup></a> In comparison to azithromycin for treatment in early infection, there is lack of strong evidence for superiority of azithromycin to benzathine penicillin G.<a class="footnote-ref" id="fnref:167" href="#fn:167"><sup>167</sup></a> </p> <h3>Late infections</h3> <p>For neurosyphilis, due to the poor penetration of benzathine penicillin into the <a href="/facts/Central_nervous_system/k8I6To97">central nervous system</a>, those affected are given large doses of <a href="/facts/Intravenous_therapy/AwwuD3Nu">intravenous</a> <a href="/facts/Penicillin_G/f5mRK45E">penicillin G</a> for a minimum of 10 days.<a class="footnote-ref" id="fnref:168" href="#fn:168"><sup>168</sup></a><a class="footnote-ref" id="fnref:169" href="#fn:169"><sup>169</sup></a> If a person is allergic to penicillin, ceftriaxone may be used or penicillin <a href="/facts/Desensitization_(medicine)/wGguKLJk">desensitization</a> attempted.<a class="footnote-ref" id="fnref:170" href="#fn:170"><sup>170</sup></a> Other late presentations may be treated with once-weekly intramuscular benzathine penicillin for three weeks.<a class="footnote-ref" id="fnref:171" href="#fn:171"><sup>171</sup></a> Treatment at this stage solely limits further progression of the disease and has a limited effect on damage which has already occurred.<a class="footnote-ref" id="fnref:172" href="#fn:172"><sup>172</sup></a> Serologic cure can be measured when the non-treponemal titers decline by a factor of 4 or more in 6–12 months in early syphilis or 12–24 months in late syphilis.<a class="footnote-ref" id="fnref:173" href="#fn:173"><sup>173</sup></a> </p> <h3>Jarisch–Herxheimer reaction</h3> <p>One of the potential side effects of treatment is the <a href="/facts/Jarisch%E2%80%93Herxheimer_reaction/fak3o8Px">Jarisch–Herxheimer reaction</a>.<a class="footnote-ref" id="fnref:174" href="#fn:174"><sup>174</sup></a> It frequently starts within one hour and lasts for 24 hours, with symptoms of fever, muscle pains, headache, and a <a href="/facts/Tachycardia/ycmyzP7q">fast heart rate</a>.<a class="footnote-ref" id="fnref:175" href="#fn:175"><sup>175</sup></a> It is results from the release of pro-inflammatory cytokines by the immune system in response to <a href="/facts/Lipoprotein/FUFotgeL">lipoproteins</a> released from rupturing syphilis bacteria.<a class="footnote-ref" id="fnref:176" href="#fn:176"><sup>176</sup></a> </p> <h3>Pregnancy</h3> <p>Penicillin is an effective treatment for syphilis in pregnancy<a class="footnote-ref" id="fnref:177" href="#fn:177"><sup>177</sup></a> but there is no agreement on which dose or route of delivery is most effective.<a class="footnote-ref" id="fnref:178" href="#fn:178"><sup>178</sup></a> </p> <h2 id="epidemiology">Epidemiology</h2> <p class="note">Main article: <a href="/facts/Epidemiology_of_syphilis/tauNuo0v">Epidemiology of syphilis</a></p> <p>In 2012, about 0.5% of adults were infected with syphilis, with 6 million new cases.<a class="footnote-ref" id="fnref:179" href="#fn:179"><sup>179</sup></a> In 1999, it is believed to have infected 12 million additional people, with greater than 90% of cases in the <a href="/facts/Developing_world/eTfS4kxl">developing world</a>.<a class="footnote-ref" id="fnref:180" href="#fn:180"><sup>180</sup></a> It affects between 700,000 and 1.6 million pregnancies a year, resulting in <a href="/facts/Miscarriage/sFq0vdnU">miscarriages</a>, <a href="/facts/Stillbirth/x3UcW2P7">stillbirths</a>, and congenital syphilis.<a class="footnote-ref" id="fnref:181" href="#fn:181"><sup>181</sup></a> During 2015, it caused about 107,000 deaths, down from 202,000 in 1990.<a class="footnote-ref" id="fnref:182" href="#fn:182"><sup>182</sup></a><a class="footnote-ref" id="fnref:183" href="#fn:183"><sup>183</sup></a> In <a href="/facts/Sub-Saharan_Africa/p4u389aa">sub-Saharan Africa</a>, syphilis contributes to approximately 20% of <a href="/facts/Perinatal_death/ua1GwEAL">perinatal deaths</a>.<a class="footnote-ref" id="fnref:184" href="#fn:184"><sup>184</sup></a> Rates are proportionally higher among <a href="/facts/Recreational_drug_use/eoBD3vKn">intravenous drug users</a>, those who are infected with <a href="/facts/HIV/ulY2rgzu">HIV</a>, and men who have sex with men.<a class="footnote-ref" id="fnref:185" href="#fn:185"><sup>185</sup></a><a class="footnote-ref" id="fnref:186" href="#fn:186"><sup>186</sup></a><a class="footnote-ref" id="fnref:187" href="#fn:187"><sup>187</sup></a> In the United States about 55,400 people are newly infected each year as of 2014<a href="https://en.wikipedia.org/w/index.php?title=Syphilis&action=edit">[update]</a>.<a class="footnote-ref" id="fnref:188" href="#fn:188"><sup>188</sup></a> <a href="/facts/African_American/pTgcAdo8">African Americans</a> accounted for almost half of all cases in 2010.<a class="footnote-ref" id="fnref:189" href="#fn:189"><sup>189</sup></a> As of 2014, syphilis infections continue to increase in the United States.<a class="footnote-ref" id="fnref:190" href="#fn:190"><sup>190</sup></a><a class="footnote-ref" id="fnref:191" href="#fn:191"><sup>191</sup></a> In the United States as of 2020, rates of syphilis have increased by more than threefold; in 2018 approximately 86% of all cases of syphilis in the United States were in men.<a class="footnote-ref" id="fnref:192" href="#fn:192"><sup>192</sup></a> In 2021, preliminary CDC data illustrated that 2,677 cases of congenital syphilis were found in the population of 332 million in the United States.<a class="footnote-ref" id="fnref:193" href="#fn:193"><sup>193</sup></a> </p><p>Syphilis was very common in Europe during the 18th and 19th centuries.<a class="footnote-ref" id="fnref:194" href="#fn:194"><sup>194</sup></a> <a href="/facts/Gustave_Flaubert/K2pKeafh">Flaubert</a> found it universal among 19th-century Egyptian prostitutes.<a class="footnote-ref" id="fnref:195" href="#fn:195"><sup>195</sup></a> In the developed world during the early 20th century, infections declined rapidly with the widespread use of <a href="/facts/Antibiotic/sF1kIfxg">antibiotics</a>, until the 1980s and 1990s.<a class="footnote-ref" id="fnref:196" href="#fn:196"><sup>196</sup></a> Since 2000, rates of syphilis have been increasing in the US, Canada, the UK, Australia and Europe, primarily among men who have sex with men.<a class="footnote-ref" id="fnref:197" href="#fn:197"><sup>197</sup></a> Rates of syphilis among US women have remained stable during this time, while rates among UK women have increased, but at a rate less than that of men.<a class="footnote-ref" id="fnref:198" href="#fn:198"><sup>198</sup></a> Increased rates among heterosexuals have occurred in China and Russia since the 1990s.<a class="footnote-ref" id="fnref:199" href="#fn:199"><sup>199</sup></a> This has been attributed to unsafe sexual practices, such as sexual promiscuity, prostitution, and decreasing use of barrier protection.<a class="footnote-ref" id="fnref:200" href="#fn:200"><sup>200</sup></a><a class="footnote-ref" id="fnref:201" href="#fn:201"><sup>201</sup></a><a class="footnote-ref" id="fnref:202" href="#fn:202"><sup>202</sup></a> </p><p>Left untreated, it has a mortality rate of 8% to 58%, with a greater death rate among males.<a class="footnote-ref" id="fnref:203" href="#fn:203"><sup>203</sup></a> The symptoms of syphilis have become less severe over the 19th and 20th centuries, in part due to widespread availability of effective treatment, and partly due to <a href="/facts/Virulence/TYmX1Fa6">virulence</a> of the bacteria.<a class="footnote-ref" id="fnref:204" href="#fn:204"><sup>204</sup></a> With early treatment, few complications result.<a class="footnote-ref" id="fnref:205" href="#fn:205"><sup>205</sup></a> Syphilis increases the risk of HIV transmission by two to five times, and coinfection is common (30–60% in some urban centers).<a class="footnote-ref" id="fnref:206" href="#fn:206"><sup>206</sup></a><a class="footnote-ref" id="fnref:207" href="#fn:207"><sup>207</sup></a> In 2015, <a href="/facts/Cuba/vHjTXLPW">Cuba</a> became the first country to eliminate mother-to-child transmission of syphilis.<a class="footnote-ref" id="fnref:208" href="#fn:208"><sup>208</sup></a> </p> <h2 id="history">History</h2> <p class="note">Main article: <a href="/facts/History_of_syphilis/LmABqSkN">History of syphilis</a></p> <h3>Origin, spread and discovery</h3> <p><a href="/facts/Paleopathology/sz4D6kHR">Paleopathologists</a> have known for decades that syphilis was present in the Americas before European contact.<a class="footnote-ref" id="fnref:209" href="#fn:209"><sup>209</sup></a><a class="footnote-ref" id="fnref:210" href="#fn:210"><sup>210</sup></a> The situation in <a href="/facts/Afro-Eurasia/ADb5HYnJ">Afro-Eurasia</a> has been murkier and caused considerable debate.<a class="footnote-ref" id="fnref:211" href="#fn:211"><sup>211</sup></a> According to the Columbian theory, syphilis was brought to Spain by the men who sailed with <a href="/facts/Christopher_Columbus/8hLAb46S">Christopher Columbus</a> in 1492 and spread from there, with a serious epidemic in <a href="/facts/Naples/SXrFcg2C">Naples</a> beginning as early as 1495. Contemporaries believed the disease sprang from American roots, and in the 16th century physicians wrote extensively about the new disease inflicted on them by the returning explorers.<a class="footnote-ref" id="fnref:212" href="#fn:212"><sup>212</sup></a> </p><p>Most evidence supports the Columbian origin hypothesis.<a class="footnote-ref" id="fnref:213" href="#fn:213"><sup>213</sup></a> However, beginning in the 1960s, examples of probable <a href="/facts/Treponematosis/tH1sNjGX">treponematosis</a>—the parent disease of syphilis, <a href="/facts/Nonvenereal_endemic_syphilis/rh0HY3qX">bejel</a>, and <a href="/facts/Yaws/obmknqrq">yaws</a>—in skeletal remains shifted the opinion of some towards a "pre-Columbian" origin.<a class="footnote-ref" id="fnref:214" href="#fn:214"><sup>214</sup></a><a class="footnote-ref" id="fnref:215" href="#fn:215"><sup>215</sup></a> A 2024 study published in <i><a href="/facts/Nature_(journal)/XmlJXkFx">Nature</a></i> supported an emergence postdating human occupation in the Americas.<a class="footnote-ref" id="fnref:216" href="#fn:216"><sup>216</sup></a> </p><p>When living conditions changed with urbanization, elite social groups began to practice basic hygiene and started to separate themselves from other social tiers. Consequently, treponematosis was driven out of the age group in which it had become endemic. It then began to appear in adults as syphilis. Because they had never been exposed as children, they were not able to fend off serious illness. Spreading the disease via sexual contact also led to victims being infected with a massive bacterial load from open sores on the genitalia. Adults in higher socioeconomic groups then became very sick with painful and debilitating symptoms lasting for decades. Often, they died of the disease, as did their children who were infected with congenital syphilis. The difference between rural and urban populations was first noted by Ellis Herndon Hudson, a clinician who published extensively about the prevalence of treponematosis, including syphilis, in times past.<a class="footnote-ref" id="fnref:217" href="#fn:217"><sup>217</sup></a> The importance of bacterial load was first noted by the physician Ernest Grin in 1952 in his study of syphilis in Bosnia.<a class="footnote-ref" id="fnref:218" href="#fn:218"><sup>218</sup></a> </p><p>The most compelling evidence for the validity of the pre-Columbian hypothesis is the presence of syphilitic-like damage to bones and teeth in medieval skeletal remains. While the absolute number of cases is not large, new ones are continually discovered, most recently in 2015.<a class="footnote-ref" id="fnref:219" href="#fn:219"><sup>219</sup></a> At least fifteen cases of acquired treponematosis based on evidence from bones, and six examples of congenital treponematosis based on evidence from teeth, are now widely accepted. In several of the twenty-one cases the evidence may also indicate syphilis.<a class="footnote-ref" id="fnref:220" href="#fn:220"><sup>220</sup></a> </p> <p>In 2020, a group of leading paleopathologists concluded that enough evidence had been collected to prove that treponemal disease, almost certainly including syphilis, had existed in Europe prior to the voyages of Columbus.<a class="footnote-ref" id="fnref:221" href="#fn:221"><sup>221</sup></a> There is an outstanding issue, however. Damaged teeth and bones may seem to hold proof of pre-Columbian syphilis, but there is a possibility that they point to an endemic form of treponemal disease instead. As syphilis, bejel, and yaws vary considerably in mortality rates and the level of human disease they elicit, it is important to know which one is under discussion in any given case, but it remains difficult for paleopathologists to distinguish among them. (The fourth of the treponemal diseases is <a href="/facts/Pinta_(disease)/ctdsKPcB">pinta</a>, a skin disease and therefore unrecoverable through paleopathology.) Ancient <a href="/facts/DNA/nB89Iauz">DNA</a> (aDNA) holds the answer, because just as only aDNA suffices to distinguish between syphilis and other diseases that produce similar symptoms in the body, it alone can differentiate <a href="/facts/Spirochaete/UAy2oy6I">spirochetes</a> that are 99.8 percent identical with absolute accuracy.<a class="footnote-ref" id="fnref:222" href="#fn:222"><sup>222</sup></a> Progress on uncovering the historical extent of syndromes through aDNA remains slow, however, because the bacterium responsible for treponematosis is rare in skeletal remains and fragile, making it notoriously difficult to recover and analyse. Precise dating to the medieval period is not yet possible but work by Kettu Majander et al. uncovering the presence of several different kinds of treponematosis at the beginning of the early modern period argues against its recent introduction from elsewhere. Therefore, they argue, treponematosis—possibly including syphilis—almost certainly existed in medieval Europe.<a class="footnote-ref" id="fnref:223" href="#fn:223"><sup>223</sup></a> </p><p>Despite significant progress in tracing the presence of syphilis in past historic periods, definitive findings from paleopathology and aDNA studies are still lacking for the medieval period. Evidence from art is therefore helpful in settling the issue. Research by Marylynn Salmon has demonstrated that deformities in medieval subjects can be identified by comparing them to those of modern victims of syphilis in medical drawings and photographs.<a class="footnote-ref" id="fnref:224" href="#fn:224"><sup>224</sup></a> One of the most typical deformities, for example, is a collapsed nasal bridge called <a href="/facts/Saddle_nose/4SVB8NS4">saddle nose</a>. Salmon discovered that it appeared often in <a href="/facts/Illuminated_manuscript/4IPxhUdM">medieval illuminations</a>, especially among the men tormenting Christ in scenes of the crucifixion. The association of saddle nose with evil is an indication that the artists were thinking of syphilis, which is typically transmitted through sexual intercourse with promiscuous partners, a mortal sin in medieval times. </p><p>It remains mysterious why the authors of medieval medical treatises so uniformly refrained from describing syphilis or commenting on its existence in the population. Many may have confused it with other diseases such as leprosy (<a href="/facts/Leprosy/FSjTpMEB">Hansen's disease</a>) or <a href="/facts/Elephantiasis/ChDKLC2d">elephantiasis</a>. The great variety of symptoms of treponematosis, the different ages at which the various diseases appear, and its widely divergent outcomes depending on climate and culture, would have added greatly to the confusion of medical practitioners, as indeed they did right down to the middle of the 20th century. In addition, evidence indicates that some writers on disease feared the political implications of discussing a condition more fatal to elites than to commoners. Historian Jon Arrizabalaga has investigated this question for <a href="/facts/Castile_(historical_region)/dfWv4sse">Castile</a> with startling results revealing an effort to hide its association with elites.<a class="footnote-ref" id="fnref:225" href="#fn:225"><sup>225</sup></a> </p><p>The first written records of an outbreak of syphilis in Europe occurred in 1495 in <a href="/facts/Naples/SXrFcg2C">Naples, Italy</a>, during a French invasion (<a href="/facts/Italian_War_of_1494%E2%80%9398/ArYBa0EA">Italian War of 1494–98</a>).<a class="footnote-ref" id="fnref:226" href="#fn:226"><sup>226</sup></a><a class="footnote-ref" id="fnref:227" href="#fn:227"><sup>227</sup></a> Since it was claimed to have been spread by French troops, it was initially called the "French disease" by the people of Naples.<a class="footnote-ref" id="fnref:228" href="#fn:228"><sup>228</sup></a> The disease reached <a href="/facts/London/KozCCsy9">London</a> in 1497 and was recorded at St Bartholomew's Hospital as infecting 10 out of the 20 patients.<a class="footnote-ref" id="fnref:229" href="#fn:229"><sup>229</sup></a> In 1530, the pastoral name "syphilis" (the name of a character) was first used by the Italian physician and poet <a href="/facts/Girolamo_Fracastoro/tF8SfRzv">Girolamo Fracastoro</a> as the title of his <a href="/facts/Latin/pM3Kge85">Latin</a> poem in <a href="/facts/Dactylic_hexameter/PzpmyFka">dactylic hexameter</a> <i><a href="/facts/Syphilis_sive_morbus_gallicus/tF8SfRzv">Syphilis sive morbus gallicus</a></i> (<i>Syphilis or The French Disease</i>) describing the ravages of the disease in Italy.<a class="footnote-ref" id="fnref:230" href="#fn:230"><sup>230</sup></a><a class="footnote-ref" id="fnref:231" href="#fn:231"><sup>231</sup></a> In Great Britain it was also called the "Great Pox".<a class="footnote-ref" id="fnref:232" href="#fn:232"><sup>232</sup></a><a class="footnote-ref" id="fnref:233" href="#fn:233"><sup>233</sup></a> </p><p>In the 16th through 19th centuries, syphilis was one of the largest public health burdens in <a href="/facts/Prevalence/6UTuTGTH">prevalence</a>, symptoms, and disability,<a class="footnote-ref" id="fnref:234" href="#fn:234"><sup>234</sup></a>: 208–209 <a class="footnote-ref" id="fnref:235" href="#fn:235"><sup>235</sup></a> although records of its true prevalence were generally not kept because of the fearsome and sordid status of <a href="/facts/Sexually_transmitted_infections/IYL1rxdI">sexually transmitted infections</a> in those centuries.<a class="footnote-ref" id="fnref:236" href="#fn:236"><sup>236</sup></a>: 208–209 According to a 2020 study, more than 20% of individuals in the age range 15–34 years in late 18th-century London were treated for syphilis.<a class="footnote-ref" id="fnref:237" href="#fn:237"><sup>237</sup></a> At the time the <a href="/facts/Causative_agent/VakFWTsg">causative agent</a> was unknown but it was well known that it was spread sexually and also often from mother to child. Its association with sex, especially <a href="/facts/Sexual_promiscuity/nLzNh2Md">sexual promiscuity</a> and <a href="/facts/Prostitution/LS7VeWB5">prostitution</a>, made it an object of fear and revulsion and a taboo. The magnitude of its morbidity and mortality in those centuries reflected that, unlike today, there was no adequate understanding of its <a href="/facts/Pathogenesis/o9kHHK0U">pathogenesis</a> and no truly effective treatments. Its damage was caused not so much by great sickness or death early in the course of the disease but rather by its gruesome effects decades after infection as it progressed to <a href="/facts/Neurosyphilis/RyqWG559">neurosyphilis</a> with <a href="/facts/Tabes_dorsalis/P8yYXsvA">tabes dorsalis</a>. <a href="/facts/Mercury_(element)/WlxfoHva">Mercury</a> compounds and isolation were commonly used, with treatments often worse than the disease.<a class="footnote-ref" id="fnref:238" href="#fn:238"><sup>238</sup></a> </p><p>The causative organism, <i>Treponema pallidum</i>, was first identified by <a href="/facts/Fritz_Schaudinn/pV4wvhua">Fritz Schaudinn</a> and <a href="/facts/Erich_Hoffmann/TJG8exPt">Erich Hoffmann</a>, in 1905.<a class="footnote-ref" id="fnref:239" href="#fn:239"><sup>239</sup></a> The first effective treatment for syphilis was <a href="/facts/Arsphenamine/KehAqjeq">arsphenamine</a>, discovered by <a href="/facts/Sahachiro_Hata/CqTzREFJ">Sahachiro Hata</a> in 1909, during a survey of hundreds of newly synthesized organic <a href="/facts/Arsenic/k1c4f44D">arsenical</a> compounds led by <a href="/facts/Paul_Ehrlich/6XM57Clc">Paul Ehrlich</a>. It was manufactured and marketed from 1910 under the trade name <a href="/facts/Salvarsan/KehAqjeq">Salvarsan</a> by <a href="/facts/Hoechst_AG/jC4ydehg">Hoechst AG</a>.<a class="footnote-ref" id="fnref:240" href="#fn:240"><sup>240</sup></a> This <a href="/facts/Organoarsenic_chemistry/BW425S1q">organoarsenic compound</a> was the first modern <a href="/facts/Antimicrobial_chemotherapy/LfFFRJjk">chemotherapeutic agent</a>. </p><p>During the 20th century, as both <a href="/facts/Microbiology/k7udsq81">microbiology</a> and <a href="/facts/Pharmacology/4Rx8s7Ie">pharmacology</a> advanced greatly, syphilis, like many other infectious diseases, became more of a manageable burden than a scary and disfiguring mystery, at least in <a href="/facts/Developed_countries/sqwTSDHm">developed countries</a> among those people who could afford to pay for timely diagnosis and treatment. Penicillin was discovered in 1928, and effectiveness of treatment with <a href="/facts/Penicillin/Abo8VQ3p">penicillin</a> was confirmed in trials in 1943,<a class="footnote-ref" id="fnref:241" href="#fn:241"><sup>241</sup></a> at which time it became the main treatment.<a class="footnote-ref" id="fnref:242" href="#fn:242"><sup>242</sup></a> </p><p>Many famous historical figures, including <a href="/facts/Franz_Schubert/M5UAjUp7">Franz Schubert</a>, <a href="/facts/Arthur_Schopenhauer/pYt2cRmc">Arthur Schopenhauer</a>, <a href="/facts/%C3%89douard_Manet/DBUNSRLt">Édouard Manet</a>,<a class="footnote-ref" id="fnref:243" href="#fn:243"><sup>243</sup></a> <a href="/facts/Charles_Baudelaire/p1DGFdBa">Charles Baudelaire</a>,<a class="footnote-ref" id="fnref:244" href="#fn:244"><sup>244</sup></a> and <a href="/facts/Guy_de_Maupassant/Af7v2SN2">Guy de Maupassant</a> are believed to have had the disease.<a class="footnote-ref" id="fnref:245" href="#fn:245"><sup>245</sup></a> <a href="/facts/Friedrich_Nietzsche/u7VdQ5sg">Friedrich Nietzsche</a> was long believed to have gone mad as a result of <a href="/facts/Tertiary_syphilis/fdnGLyLT">tertiary syphilis</a>, but that diagnosis has recently come into question.<a class="footnote-ref" id="fnref:246" href="#fn:246"><sup>246</sup></a> </p> <h3>Arts and literature</h3> <p class="note">See also: <a href="/facts/List_of_syphilis_cases/uBBvfwtx">List of syphilis cases</a></p> <p>The earliest known depiction of an individual with syphilis is <a href="/facts/Albrecht_D%C3%BCrer/N38jX769">Albrecht Dürer</a>'s <i><a href="/facts/Syphilitic_Man/qVwW7jjw">Syphilitic Man</a></i> (1496), a woodcut believed to represent a <a href="/facts/Landsknecht/P2RvU1QJ">Landsknecht</a>, a Northern European <a href="/facts/Mercenary/uQSfwcDR">mercenary</a>.<a class="footnote-ref" id="fnref:247" href="#fn:247"><sup>247</sup></a> The myth of the <i><a href="/facts/Femme_fatale/Xm8E98jJ">femme fatale</a></i> or "poison women" of the 19th century is believed to be partly derived from the devastation of syphilis, with classic examples in literature including <a href="/facts/John_Keats/lImImXhl">John Keats</a>' "<a href="/facts/La_Belle_Dame_sans_Merci/9UnvqQoq">La Belle Dame sans Merci</a>".<a class="footnote-ref" id="fnref:248" href="#fn:248"><sup>248</sup></a><a class="footnote-ref" id="fnref:249" href="#fn:249"><sup>249</sup></a> </p><p>The Flemish artist <a href="/facts/Stradanus/yeudVGo6">Stradanus</a> designed a print called <i>Preparation and Use of Guayaco for Treating Syphilis</i>, a scene of a wealthy man receiving treatment for syphilis with the tropical wood <a href="/facts/Guaiacum/vhuR2Yyb">guaiacum</a> sometime around 1590.<a class="footnote-ref" id="fnref:250" href="#fn:250"><sup>250</sup></a> </p> <h3>Tuskegee and Guatemala studies</h3> <p class="note">See also: <a href="/facts/Tuskegee_syphilis_experiment/RtreVUKu">Tuskegee syphilis experiment</a> and <a href="/facts/Guatemala_syphilis_experiment/C2IF4M9f">Guatemala syphilis experiment</a></p> <p>The "Tuskegee Study of Untreated Syphilis in the Negro Male" was an infamous, unethical and racist <a href="/facts/Clinical_study/q8LMr832">clinical study</a> conducted between 1932 and 1972 by the <a href="/facts/U.S._Public_Health_Service/utUnKRuS">U.S. Public Health Service</a>.<a class="footnote-ref" id="fnref:251" href="#fn:251"><sup>251</sup></a><a class="footnote-ref" id="fnref:252" href="#fn:252"><sup>252</sup></a> Whereas the purpose of this study was to observe the <a href="/facts/Natural_history_of_disease/1aaqxVb5">natural history</a> of untreated syphilis; the African-American men in the study were told they were receiving free treatment for "bad blood" from the United States government.<a class="footnote-ref" id="fnref:253" href="#fn:253"><sup>253</sup></a> </p><p>The Public Health Service started working on this study in 1932 in collaboration with <a href="/facts/Tuskegee_University/k0EELXz1">Tuskegee University</a>, a <a href="/facts/Historically_black_college/NC4q44T5">historically black college</a> in Alabama. Researchers enrolled 600 poor, African American <a href="/facts/Sharecroppers/J0DshurW">sharecroppers</a> from <a href="/facts/Macon_County,_Alabama/VcMEuV4Q">Macon County</a>, <a href="/facts/Alabama/1Xk8EveN">Alabama</a> in the study. Of these men, 399 had contracted syphilis before the study began, and 201 did not have the disease.<a class="footnote-ref" id="fnref:254" href="#fn:254"><sup>254</sup></a> Medical care, hot meals and free burial insurance were given to those who participated. The men were told that the study would last six months, but in the end, it continued for 40 years.<a class="footnote-ref" id="fnref:255" href="#fn:255"><sup>255</sup></a> After funding for treatment was lost, the study was continued without informing the men that they were only being studied and would not be treated. Facing insufficient participation, the Macon County Health Department nevertheless wrote to subjects to offer them a "last chance" to get a special "treatment", which was not a treatment at all, but a spinal tap administered exclusively for diagnostic purposes.<a class="footnote-ref" id="fnref:256" href="#fn:256"><sup>256</sup></a> None of the men infected were ever told that they had the disease, and none were treated with <a href="/facts/Penicillin/Abo8VQ3p">penicillin</a> even after the antibiotic had been proven to successfully treat syphilis. According to the <a href="/facts/Centers_for_Disease_Control/NmoJNDV5">Centers for Disease Control</a>, the men were told they were being treated for "bad blood"—a colloquialism describing various conditions such as fatigue, <a href="/facts/Anemia/AgEPPmg8">anemia</a> and syphilis—which was a leading cause of death among southern African American men.<a class="footnote-ref" id="fnref:257" href="#fn:257"><sup>257</sup></a> </p><p>The 40-year study became a textbook example of criminally negligent <a href="/facts/Medical_ethics/Dm4TCznf">medical ethics</a> because researchers had knowingly withheld treatment with <a href="/facts/Penicillin/Abo8VQ3p">penicillin</a> and because the subjects had been misled concerning the purposes of the study. The revelation in 1972 of these study failures by a <a href="/facts/Whistleblower/Ah5QHEW1">whistleblower</a>, <a href="/facts/Peter_Buxtun/Au6qXllA">Peter Buxtun</a>, led to major changes in U.S. law and regulation on the protection of participants in clinical studies. Now studies require <a href="/facts/Informed_consent/V1vL4QSj">informed consent</a>,<a class="footnote-ref" id="fnref:258" href="#fn:258"><sup>258</sup></a> communication of <a href="/facts/Diagnosis/VcsPwshd">diagnosis</a>, and accurate reporting of test results.<a class="footnote-ref" id="fnref:259" href="#fn:259"><sup>259</sup></a> </p> <p>Similar experiments were carried out in <a href="/facts/Guatemala/MoMcSnla">Guatemala</a> from 1946 to 1948. It was done during the administration of American President <a href="/facts/Harry_S._Truman/2E2LmMoB">Harry S. Truman</a> and Guatemalan President <a href="/facts/Juan_Jos%C3%A9_Ar%C3%A9valo/MayTEDbA">Juan José Arévalo</a> with the cooperation of some Guatemalan health ministries and officials.<a class="footnote-ref" id="fnref:260" href="#fn:260"><sup>260</sup></a> Doctors infected soldiers, prostitutes, prisoners and <a href="/facts/Mental_patient/EPNjFtFf">mental patients</a> with syphilis and other <a href="/facts/Sexually_transmitted_infection/IYL1rxdI">sexually transmitted infections</a>, without the <a href="/facts/Informed_consent/V1vL4QSj">informed consent</a> of the subjects and treated most subjects with <a href="/facts/Antibiotic/sF1kIfxg">antibiotics</a>. The experiment resulted in at least 83 deaths.<a class="footnote-ref" id="fnref:261" href="#fn:261"><sup>261</sup></a><a class="footnote-ref" id="fnref:262" href="#fn:262"><sup>262</sup></a> In October 2010, the U.S. formally apologized to Guatemala for the ethical violations that took place. Secretary of State <a href="/facts/Hillary_Clinton/dPzm9ru4">Hillary Clinton</a> and Health and Human Services Secretary <a href="/facts/Kathleen_Sebelius/lucT3VXc">Kathleen Sebelius</a> stated "Although these events occurred more than 64 years ago, we are outraged that such reprehensible research could have occurred under the guise of public health. We deeply regret that it happened, and we apologize to all the individuals who were affected by such abhorrent research practices."<a class="footnote-ref" id="fnref:263" href="#fn:263"><sup>263</sup></a> The experiments were led by physician <a href="/facts/John_Charles_Cutler/J0SwbJVn">John Charles Cutler</a> who also participated in the late stages of the Tuskegee syphilis experiment.<a class="footnote-ref" id="fnref:264" href="#fn:264"><sup>264</sup></a> </p> <h3>Names</h3> <p>Syphilis was first called <i>grande verole</i> or the "great pox" by the French. Other historical names have included "button scurvy", sibbens, frenga and dichuchwa, among others.<a class="footnote-ref" id="fnref:265" href="#fn:265"><sup>265</sup></a><a class="footnote-ref" id="fnref:266" href="#fn:266"><sup>266</sup></a> Since it was a disgraceful disease, the disease was known in several countries by the name of their neighbouring, often hostile country.<a class="footnote-ref" id="fnref:267" href="#fn:267"><sup>267</sup></a> The English, the Germans, and the Italians called it "the French disease", while the French referred to it as the "Neapolitan disease". The Dutch called it the "Spanish/Castilian disease".<a class="footnote-ref" id="fnref:268" href="#fn:268"><sup>268</sup></a> To the Turks it was known as the "Christian disease", whilst in India, the Hindus and Muslims named the disease after each other.<a class="footnote-ref" id="fnref:269" href="#fn:269"><sup>269</sup></a> </p> <h2 id="further-reading">Further reading</h2> <ul><li>Ghanem KG, Ram S, Rice PA (February 2020). "The Modern Epidemic of Syphilis". <i>N. Engl. J. Med</i>. 382 (9): 845–854. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1056%2FNEJMra1901593">10.1056/NEJMra1901593</a>. <a href="/facts/PMID_(identifier)/JlHAvMHt">PMID</a> <a href="https://pubmed.ncbi.nlm.nih.gov/32101666">32101666</a>. <a href="/facts/S2CID_(identifier)/ldJsHa2Y">S2CID</a> <a href="https://api.semanticscholar.org/CorpusID:211537893">211537893</a>.</li> <li>Ropper AH (October 2019). "Neurosyphilis". <i>N. Engl. J. Med</i>. 381 (14): 1358–1363. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1056%2FNEJMra1906228">10.1056/NEJMra1906228</a>. <a href="/facts/PMID_(identifier)/JlHAvMHt">PMID</a> <a href="https://pubmed.ncbi.nlm.nih.gov/31577877">31577877</a>. <a href="/facts/S2CID_(identifier)/ldJsHa2Y">S2CID</a> <a href="https://api.semanticscholar.org/CorpusID:242487360">242487360</a>.</li></ul> <h2 id="external-links">External links</h2> Wikipedia's health care articles can be viewed offline with the Medical Wikipedia app. <ul><li><a href="https://www.cdc.gov/std/Syphilis/STDFact-Syphilis.htm">"Syphilis - CDC Fact Sheet"</a> <a href="/facts/Centers_for_Disease_Control_and_Prevention/NmoJNDV5">Centers for Disease Control and Prevention</a> (CDC)</li> <li><a href="http://hivinsite.ucsf.edu/InSite?page=kb-05-01-04">UCSF HIV InSite Knowledge Base Chapter: Syphilis and HIV</a> <a href="https://web.archive.org/web/20130120002214/http://hivinsite.ucsf.edu/InSite?page=kb-05-01-04">Archived</a> 20 January 2013 at the <a href="/facts/Wayback_Machine/nmQ3a6JC">Wayback Machine</a></li> <li><a href="https://www.cdc.gov/std/syphsurvreco.pdf">Recommendations for Public Health Surveillance of Syphilis in the United States</a></li> <li>Pastuszczak M, Wojas-Pelc A (2013). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3834708">"Current standards for diagnosis and treatment of syphilis: Selection of some practical issues, based on the European (IUSTI) and U.S. (CDC) guidelines"</a>. <i>Advances in Dermatology and Allergology</i>. 30 (4): 203–210. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.5114%2Fpdia.2013.37029">10.5114/pdia.2013.37029</a>. <a href="/facts/PMC_(identifier)/dX1zMt71">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3834708">3834708</a>. <a href="/facts/PMID_(identifier)/JlHAvMHt">PMID</a> <a href="https://pubmed.ncbi.nlm.nih.gov/24278076">24278076</a>.</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Ghanem KG, Hook EW (2020). "303. Syphilis". In Goldman L, Schafer AI (eds.). Goldman-Cecil Medicine. Vol. 2 (26th ed.). Philadelphia: Elsevier. pp. 1983–1989. ISBN 978-0-323-55087-1. <a href="978-0-323-55087-1" target="_blank">978-0-323-55087-1</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Ghanem KG, Hook EW (2020). "303. Syphilis". In Goldman L, Schafer AI (eds.). Goldman-Cecil Medicine. Vol. 2 (26th ed.). Philadelphia: Elsevier. pp. 1983–1989. ISBN 978-0-323-55087-1. <a href="978-0-323-55087-1" target="_blank">978-0-323-55087-1</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"Syphilis – CDC Fact Sheet (Detailed)". CDC. 2 November 2015. Archived from the original on 6 February 2016. Retrieved 3 February 2016. <a href="https://www.cdc.gov/std/syphilis/stdfact-syphilis-detailed.htm" target="_blank">https://www.cdc.gov/std/syphilis/stdfact-syphilis-detailed.htm</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"Syphilis – CDC Fact Sheet (Detailed)". CDC. 2 November 2015. Archived from the original on 6 February 2016. Retrieved 3 February 2016. <a href="https://www.cdc.gov/std/syphilis/stdfact-syphilis-detailed.htm" target="_blank">https://www.cdc.gov/std/syphilis/stdfact-syphilis-detailed.htm</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>"Syphilis – CDC Fact Sheet (Detailed)". CDC. 2 November 2015. Archived from the original on 6 February 2016. 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"Syphilis in composers and musicians – Mozart, Beethoven, Paganini, Schubert, Schumann, Smetana". European Journal of Clinical Microbiology & Infectious Diseases. 27 (12): 1151–57. doi:10.1007/s10096-008-0571-x. PMID 18592279. S2CID 947291. <a href="/wiki/European_Journal_of_Clinical_Microbiology_%26_Infectious_Diseases" target="_blank">/wiki/European_Journal_of_Clinical_Microbiology_%26_Infectious_Diseases</a> <a href="#fnref:29" class="footnote-back-ref">↩</a></p></li> <li id="fn:30"><p>Coffin L, Newberry A, Hagan H, Cleland C, Des Jarlais D, Perlman D (January 2010). "Syphilis in Drug Users in Low and Middle Income Countries". The International Journal on Drug Policy. 21 (1): 20–27. doi:10.1016/j.drugpo.2009.02.008. PMC 2790553. 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(1994). L'origine de la syphilis in Europe: avant ou après 1493? Paris, France: Éditions Errance. Baker, B. J. et al. (2020) "Advancing the Understanding of Treponemal Disease in the Past and Present". Yearbook of Physical Anthropology 171: 5–41. doi: 10.1002/ajpa.23988. Harper, K. N., Zuckerman, M. K., Harper, M. L., Kingston, J. D., Armelagos, G. J. (2011) "The origin and antiquity of syphilis revisited: An appraisal of Old World Pre-Columbian evidence of treponemal infections". Yearbook of Physical Anthropology, 54: 99–133. https://doi.org/10.1002/ajpa.21613. <a href="//doi.org/10.1002/ajpa.23988" target="_blank">//doi.org/10.1002/ajpa.23988</a> <a href="#fnref:211" class="footnote-back-ref">↩</a></p></li> <li id="fn:212"><p>For an introduction to this literature see Quétel, C. (1990). History of Syphilis. Baltimore, MD: The Johns Hopkins University Press. <a href="#fnref:212" class="footnote-back-ref">↩</a></p></li> <li id="fn:213"><p>Hemarjata P (17 June 2019). "Revisiting the Great Imitator: The Origin and History of Syphilis". American Society for Microbiology. Retrieved 27 November 2023. <a href="https://asm.org/Articles/2019/June/Revisiting-the-Great-Imitator,-Part-I-The-Origin-a" target="_blank">https://asm.org/Articles/2019/June/Revisiting-the-Great-Imitator,-Part-I-The-Origin-a</a> <a href="#fnref:213" class="footnote-back-ref">↩</a></p></li> <li id="fn:214"><p>Early work includes Henneberg, M., & Henneberg, R. J. (1994), "Treponematosis in an ancient Greek colony of Metaponto, southern Italy, 580-250 BCE" and Roberts, C. A. (1994), "Treponematosis in Gloucester, England: A theoretical and practical approach to the Pre-Columbian theory". Both in O. Dutour, et al. (Eds.), L'origine de la syphilis in Europe: avant ou après 1493? (pp. 92-98; 101–108). Paris, France: Éditions Errance. <a href="#fnref:214" class="footnote-back-ref">↩</a></p></li> <li id="fn:215"><p>Salmon M (13 July 2022). 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PMID 39694065. <a href="https://www.nature.com/articles/s41586-024-08515-5" target="_blank">https://www.nature.com/articles/s41586-024-08515-5</a> <a href="#fnref:216" class="footnote-back-ref">↩</a></p></li> <li id="fn:217"><p>Hudson, E. H. (1946). "A unitarian view of treponematosis". American Journal of Tropical Medicine and Hygiene, 26 (1946), 135–139. https://doi.org/10.4269/ajtmh.1946.s1-26.135; "The treponematoses—or treponematosis?" The British Journal of Venereal Diseases, 34 (1958), 22–23; "Historical approach to the terminology of syphilis". Archives of Dermatology, 84 (1961), 545–562; "Treponematosis and man's social evolution". American Anthropologist, 67(4), 885–901. doi:10.1001/archderm.1961.01580160009002. On status see also Marylynn Salmon, Medieval Syphilis and Treponemal Disease (Leeds: Arc Humanities Press), 8, 30-33. <a href="https://doi.org/10.4269/ajtmh.1946.s1-26.135" target="_blank">https://doi.org/10.4269/ajtmh.1946.s1-26.135</a> <a href="#fnref:217" class="footnote-back-ref">↩</a></p></li> <li id="fn:218"><p>Grin, E. I. (1952) "Endemic Treponematosis in Bosnia: Clinical and epidemiological observations on a successful mass-treatment campaign". Bulletin of the World Health Organization, 7: 11-25. <a href="#fnref:218" class="footnote-back-ref">↩</a></p></li> <li id="fn:219"><p>Walker, D., Powers, N., Connell, B., & Redfern, R. (2015). "Evidence of skeletal treponematosis from the Medieval burial ground of St. Mary Spital, London, and implications for the origins of the disease in Europe". American Journal of Physical Anthropology, 156, 90–101. https://doi.org/10.1002/ajpa.22630 and Gaul, J.S., Grossschmidt, K., Budenbauer, C., & Kanz, Fabian (2015). "A probable case of congenital syphilis from pre-Columbian Austria". Anthropologischer Anzeiger, 72, 451–472. DOI: 10.1127/anthranz/2015/0504. <a href="https://doi.org/10.1002/ajpa.22630" target="_blank">https://doi.org/10.1002/ajpa.22630</a> <a href="#fnref:219" class="footnote-back-ref">↩</a></p></li> <li id="fn:220"><p>They include Henneberg, M., & Henneberg, R. J. (1994). "Treponematosis in an ancient Greek colony of Metaponto, southern Italy, 580-250 BCE". In O. Dutour, et al. (Eds.), L'origine de la syphilis in Europe: Avant ou après 1493? (pp. 92–98). Paris, France: Éditions Errance. Stirland, Ann. "Evidence for Pre-Columbian Treponematosis in Europe". In Dutour, O., Pálfi, G., Bérato, J., & Brun, J. -P. (Eds.). (1994). L'origine de la syphilis in Europe: avant ou après 1493? Paris, France: Éditions Errance, and Criminals and Paupers: The Graveyard of St. Margaret Fyebriggate in combusto, Norwich. With Contributions from Brian Ayers and Jayne Brown. 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