Clinical isolates of grow consistently at temperatures up to 35 °C (95 °F). In contrast, environmental isolates of F. pedrosoi exhibit growth consistently up to 35 °C, and irregularly up to 37 °C (99 °F) Physiological studies have shown the degradation of urea and tyrosine, and the lack of growth on the proteins gelatin, casein and the purines xanthine and hypoxanthine. Likewise, lipase activity was demonstrated, but phospholipase, collagenase and amylase were not expressed.
The disease is characterized by the appearance of spherical, brownish yellow cells with thick, darkly pigmented walls. The presence of the agent is associated with host cell proliferation and enlargement known as hyperplasia localized to the stratified squamous epithelium and the formation of mycotic granulomas. Sclerotic bodies are present both extracellularly and intracellularly throughout the affected tissue and are a defining feature of chromoblastomycosis. The melanin content of sclerotic bodies may be important in the establishment of host immune responses.
Farmers in Central and South America are most susceptible to chromoblastomycosis due to F. pedrosoi. Infection often occurs in the upper body and legs of agricultural laborers since these areas are more prone to exposure to infected soil, plant debris or other fomites. The sex ratio of disease is globally variable. In Brazil, the agent has shown a 4:1 proclivity for men, likely as a function of exposure differences relating to work and lifestyle, while Japanese infections have shown evenly distributed infection rates between the sexes.
Alviano, D; Franzen, A; Travassos, L; Holandino, C; Rozental, S; Ejzemberg, R; Rodrigues, M (2004). "Melanin from Fonsecaea pedrosoi induces production of human antifungal antibodies and enhances the antimicrobial efficacy of phagocytes". Infection and Immunity. 72 (1): 229–237. doi:10.1128/IAI.72.1.229-237.2004. PMC 344007. PMID 14688100. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC344007
Deb Roy, A; Das, D; Deka, M (2013). "Chromoblastomycosis – A clinical mimic of squamous carcinoma". Australasian Medical Journal. 6 (9): 458–460. doi:10.4066/AMJ.2013.1806. PMC 3794416. PMID 24133538. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3794416
Deb Roy, A; Das, D; Deka, M (2013). "Chromoblastomycosis – A clinical mimic of squamous carcinoma". Australasian Medical Journal. 6 (9): 458–460. doi:10.4066/AMJ.2013.1806. PMC 3794416. PMID 24133538. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3794416
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Najafzadeh, M; Sun, J; Vincete, V; Klaassen, C; Bonifaz, A; Gerrits van den Ende, A; Sybren de Hoog, G (2011). "Molecular epidemiology of Fonsecaea species". Emerging Infectious Diseases. 17 (3): 464–69. doi:10.3201/eid1703.100555. PMC 3165995. PMID 21392438. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3165995
Yang, Y; Yongxuan, H; Zhang, J; Li, X; Lu, C; Xi, L; Xi, Liyan (2012). "A refractory case of chromoblastomycosis due to Fonsecaea monophora with improvement by photodynamic therapy". Medical Mycology. 50 (1): 649–653. doi:10.3109/13693786.2012.655258. PMID 22309458. https://doi.org/10.3109%2F13693786.2012.655258
Najafzadeh, M; Sun, J; Vincete, V; Klaassen, C; Bonifaz, A; Gerrits van den Ende, A; Sybren de Hoog, G (2011). "Molecular epidemiology of Fonsecaea species". Emerging Infectious Diseases. 17 (3): 464–69. doi:10.3201/eid1703.100555. PMC 3165995. PMID 21392438. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3165995
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Yang, Y; Yongxuan, H; Zhang, J; Li, X; Lu, C; Xi, L; Xi, Liyan (2012). "A refractory case of chromoblastomycosis due to Fonsecaea monophora with improvement by photodynamic therapy". Medical Mycology. 50 (1): 649–653. doi:10.3109/13693786.2012.655258. PMID 22309458. https://doi.org/10.3109%2F13693786.2012.655258
Deb Roy, A; Das, D; Deka, M (2013). "Chromoblastomycosis – A clinical mimic of squamous carcinoma". Australasian Medical Journal. 6 (9): 458–460. doi:10.4066/AMJ.2013.1806. PMC 3794416. PMID 24133538. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3794416
Deb Roy, A; Das, D; Deka, M (2013). "Chromoblastomycosis – A clinical mimic of squamous carcinoma". Australasian Medical Journal. 6 (9): 458–460. doi:10.4066/AMJ.2013.1806. PMC 3794416. PMID 24133538. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3794416
Alviano, D; Franzen, A; Travassos, L; Holandino, C; Rozental, S; Ejzemberg, R; Rodrigues, M (2004). "Melanin from Fonsecaea pedrosoi induces production of human antifungal antibodies and enhances the antimicrobial efficacy of phagocytes". Infection and Immunity. 72 (1): 229–237. doi:10.1128/IAI.72.1.229-237.2004. PMC 344007. PMID 14688100. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC344007
Alviano, D; Franzen, A; Travassos, L; Holandino, C; Rozental, S; Ejzemberg, R; Rodrigues, M (2004). "Melanin from Fonsecaea pedrosoi induces production of human antifungal antibodies and enhances the antimicrobial efficacy of phagocytes". Infection and Immunity. 72 (1): 229–237. doi:10.1128/IAI.72.1.229-237.2004. PMC 344007. PMID 14688100. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC344007
Nimrichter, L; Cerqueira, M; Leitao, E; Miranda, K; Nakayasu, E; Almeida, S; Rodrigues, M (2005). "Structure, cellular distribution, antigenicity, and biological functions of Fonsecaea pedrosoi ceramide monohexosides". Infection and Immunity. 73 (12): 7860–7868. doi:10.1128/IAI.73.12.7860-7868.2005. PMC 1307093. PMID 16299276. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1307093
Deb Roy, A; Das, D; Deka, M (2013). "Chromoblastomycosis – A clinical mimic of squamous carcinoma". Australasian Medical Journal. 6 (9): 458–460. doi:10.4066/AMJ.2013.1806. PMC 3794416. PMID 24133538. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3794416
Kondo, M; Hiruma, M; Nishioka, Y; Mochida, K; Ikeda, S; Ogawa, H (2005). "A case of chromomycosis caused by Fonsecaea pedrosoi and a review of reported cases of dematiaceous fungal infection in Japan". Mycoses. 48 (1): 221–225. doi:10.1111/j.1439-0507.2005.01089.x. PMID 15842342. S2CID 22268875. /wiki/Doi_(identifier)
Deb Roy, A; Das, D; Deka, M (2013). "Chromoblastomycosis – A clinical mimic of squamous carcinoma". Australasian Medical Journal. 6 (9): 458–460. doi:10.4066/AMJ.2013.1806. PMC 3794416. PMID 24133538. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3794416
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Deb Roy, A; Das, D; Deka, M (2013). "Chromoblastomycosis – A clinical mimic of squamous carcinoma". Australasian Medical Journal. 6 (9): 458–460. doi:10.4066/AMJ.2013.1806. PMC 3794416. PMID 24133538. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3794416
Deb Roy, A; Das, D; Deka, M (2013). "Chromoblastomycosis – A clinical mimic of squamous carcinoma". Australasian Medical Journal. 6 (9): 458–460. doi:10.4066/AMJ.2013.1806. PMC 3794416. PMID 24133538. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3794416
Kondo, M; Hiruma, M; Nishioka, Y; Mochida, K; Ikeda, S; Ogawa, H (2005). "A case of chromomycosis caused by Fonsecaea pedrosoi and a review of reported cases of dematiaceous fungal infection in Japan". Mycoses. 48 (1): 221–225. doi:10.1111/j.1439-0507.2005.01089.x. PMID 15842342. S2CID 22268875. /wiki/Doi_(identifier)
Alviano, D; Franzen, A; Travassos, L; Holandino, C; Rozental, S; Ejzemberg, R; Rodrigues, M (2004). "Melanin from Fonsecaea pedrosoi induces production of human antifungal antibodies and enhances the antimicrobial efficacy of phagocytes". Infection and Immunity. 72 (1): 229–237. doi:10.1128/IAI.72.1.229-237.2004. PMC 344007. PMID 14688100. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC344007
Kondo, M; Hiruma, M; Nishioka, Y; Mochida, K; Ikeda, S; Ogawa, H (2005). "A case of chromomycosis caused by Fonsecaea pedrosoi and a review of reported cases of dematiaceous fungal infection in Japan". Mycoses. 48 (1): 221–225. doi:10.1111/j.1439-0507.2005.01089.x. PMID 15842342. S2CID 22268875. /wiki/Doi_(identifier)
Nimrichter, L; Cerqueira, M; Leitao, E; Miranda, K; Nakayasu, E; Almeida, S; Rodrigues, M (2005). "Structure, cellular distribution, antigenicity, and biological functions of Fonsecaea pedrosoi ceramide monohexosides". Infection and Immunity. 73 (12): 7860–7868. doi:10.1128/IAI.73.12.7860-7868.2005. PMC 1307093. PMID 16299276. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1307093
Nimrichter, L; Cerqueira, M; Leitao, E; Miranda, K; Nakayasu, E; Almeida, S; Rodrigues, M (2005). "Structure, cellular distribution, antigenicity, and biological functions of Fonsecaea pedrosoi ceramide monohexosides". Infection and Immunity. 73 (12): 7860–7868. doi:10.1128/IAI.73.12.7860-7868.2005. PMC 1307093. PMID 16299276. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1307093
Kondo, M; Hiruma, M; Nishioka, Y; Mochida, K; Ikeda, S; Ogawa, H (2005). "A case of chromomycosis caused by Fonsecaea pedrosoi and a review of reported cases of dematiaceous fungal infection in Japan". Mycoses. 48 (1): 221–225. doi:10.1111/j.1439-0507.2005.01089.x. PMID 15842342. S2CID 22268875. /wiki/Doi_(identifier)
Kondo, M; Hiruma, M; Nishioka, Y; Mochida, K; Ikeda, S; Ogawa, H (2005). "A case of chromomycosis caused by Fonsecaea pedrosoi and a review of reported cases of dematiaceous fungal infection in Japan". Mycoses. 48 (1): 221–225. doi:10.1111/j.1439-0507.2005.01089.x. PMID 15842342. S2CID 22268875. /wiki/Doi_(identifier)
Yang, Y; Yongxuan, H; Zhang, J; Li, X; Lu, C; Xi, L; Xi, Liyan (2012). "A refractory case of chromoblastomycosis due to Fonsecaea monophora with improvement by photodynamic therapy". Medical Mycology. 50 (1): 649–653. doi:10.3109/13693786.2012.655258. PMID 22309458. https://doi.org/10.3109%2F13693786.2012.655258
Nimrichter, L; Cerqueira, M; Leitao, E; Miranda, K; Nakayasu, E; Almeida, S; Rodrigues, M (2005). "Structure, cellular distribution, antigenicity, and biological functions of Fonsecaea pedrosoi ceramide monohexosides". Infection and Immunity. 73 (12): 7860–7868. doi:10.1128/IAI.73.12.7860-7868.2005. PMC 1307093. PMID 16299276. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1307093
Deb Roy, A; Das, D; Deka, M (2013). "Chromoblastomycosis – A clinical mimic of squamous carcinoma". Australasian Medical Journal. 6 (9): 458–460. doi:10.4066/AMJ.2013.1806. PMC 3794416. PMID 24133538. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3794416
Nimrichter, L; Cerqueira, M; Leitao, E; Miranda, K; Nakayasu, E; Almeida, S; Rodrigues, M (2005). "Structure, cellular distribution, antigenicity, and biological functions of Fonsecaea pedrosoi ceramide monohexosides". Infection and Immunity. 73 (12): 7860–7868. doi:10.1128/IAI.73.12.7860-7868.2005. PMC 1307093. PMID 16299276. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1307093
Sangwan, Jyoti; Jachuck, SJ (2013). "Fonsecaea Pedrosoi: A rare etiology in fungal keratitis". Journal of Clinical and Diagnostic Research. 7 (10): 2272–2273. doi:10.7860/JCDR/2013/6627.3491. PMC 3843447. PMID 24298496. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3843447
Kondo, M; Hiruma, M; Nishioka, Y; Mochida, K; Ikeda, S; Ogawa, H (2005). "A case of chromomycosis caused by Fonsecaea pedrosoi and a review of reported cases of dematiaceous fungal infection in Japan". Mycoses. 48 (1): 221–225. doi:10.1111/j.1439-0507.2005.01089.x. PMID 15842342. S2CID 22268875. /wiki/Doi_(identifier)
Yang, Y; Yongxuan, H; Zhang, J; Li, X; Lu, C; Xi, L; Xi, Liyan (2012). "A refractory case of chromoblastomycosis due to Fonsecaea monophora with improvement by photodynamic therapy". Medical Mycology. 50 (1): 649–653. doi:10.3109/13693786.2012.655258. PMID 22309458. https://doi.org/10.3109%2F13693786.2012.655258