"Alfred François Donné (13 September 1801 – 7 March 1878) was a French bacteriologist and doctor. He was born in Noyon, France, and died in Paris. ...
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Donné was the discoverer of Trichomonas vaginalis. He was also the inventor of the photomicrography.
Léon Foucault was his student and laboratory assistant, and he remained a friend and supporter of Foucault until the latter's death." - (en.wikipedia.org 15.09.2023)