1907 Nobel Laureate in Physiology or Medicine
"in recognition of his work on the role played by protozoa in causing diseases" --- http://www.nobel.se/medicine/laureates/1907
Quick Facts "Laveran discovered the cause of malaria in the course of the autopsies he conducted on malaria victims. He found the causative organism to be a protozoan which he named Oscillaria malariae, though it was later renamed Plasmodium."

See: Robert Ross (also a Nobel laureate) who proved Laveran's discoveries.

1906 - Santiago Ramón y Cajal | 1908 Ilya Mechnikov