Member of the French Commission on sleeping sickness, he worked for the organisation of the mission in French Equatorial Africa.
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In 1903, together with Alphonse Laveran (1845–1922), he showed that the parasite responsible for the visceral leishmaniasis (or Kala-azar, a fever in India), first described by William Boog Leishman (1865–1926), is a new protozoa, different from Trypanosoma, the agent of the sleeping sickness, and from Plasmodium, the agent of paludism (malaria).
Felix Mendelssohn | Felix Frankfurter | Felix the Cat | Félix Guattari | María Félix | Félix Trinidad | Felix Klein | Julie Felix | Felix Rodriguez | Félix Houphouët-Boigny | Felix Da Housecat | José Félix Ribas Municipality, Aragua | Felix von Luckner | Felix Unger | Félix Rodríguez (Central Intelligence Agency) | Felix Magath | Félix Fénéon | Allyson Felix | Felix Werder | Felix the Cat: The Movie | Félix Resurrección Hidalgo | Felix Dzerzhinsky | Felix da Housecat | Felix Cavaliere | Rachel Félix | Le Mesnil-Garnier | Felix Silla | Félix Savón | Felix Nussbaum | Felix Mottl |
In 1902 Delezenne became a member of the Société de biologie, in 1903 he was co-founder of the Bulletin de l'Institut Pasteur with Amédée Borrel (1867-1936), Félix Mesnil (1868-1938), Gabriel Bertrand (1867–1962), Alexandre Besredka (1870–1940) and Auguste-Charles Marie (1864-1935), and in 1910 became a professor at the Pasteur Institute.