Un nouveau parasite trouvé dans le sang plusieurs malades atteints de fièvre palustre.

Laveran first saw the malaria parasite on 20 October 1880; he at once recognized its significance. He named it Oscillaria malariae. English translation in Kean (No. 2268.1). Laveran also published a monograph on the discovery: Nature parasitaire des accidents de l’impaludisme. Description d’un nouveau parasite trouvé dans le sang…Paris: Baillière, 1881. See also his "Note sur un nouveau parasite trouvé dans le sang de plusieurs maladies atteints de fièvre palustre," Bulletin de l’Académie de Médicine, 2^nd Series. 9 (1880) 1235-1236. 

English translations in Paludism. Translated by J.W. Martin. London: New Sydenham Society, 1893.

In 1907 Laveran was awarded the Nobel Prize for Physiology or Medicine "in recognition of his work on the role played by protozoa in causing diseases."