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Reference.org
Paul-Louis Simond
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<p>Paul-Louis Simond (30 July 1858 – 3 March 1947) was a French physician, chief medical officer and biologist whose major contribution to science was his demonstration that the intermediates in the transmission of <a href="/facts/Bubonic_plague/N9dCQ3EP">bubonic plague</a> from rats to humans are the fleas <i><a href="/facts/Xenopsylla_cheopis/XK8dvE9B">Xenopsylla cheopis</a></i> that dwell on infected rats. </p>