The identification of kala-azar and the discovery of Leishmania donovani.
D004196:Disease Outbreaks / Q000266:history; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D007891:Leishmania / Q000302:isolation & purification; D007898:Leishmaniasis, Visceral / Q000453:epidemiology / Q000266:history*