hematozoon
hematozoa

Alphonse Laveran got the 1907 Nobel Prize for his research on the role of protozoans as disease agents (notably, his discovery of the malaria hematozoon)

Haematozoa or Hematozoa is a general term that includes blood parasites, mainly protozoans.

Beiträge zur Lehre von den Hämatozoen, 1850 - Contributions to the study of hematozoa.