Canvasback ducks wintering on Chesapeake Bay had a 6% incidence of Leucocytozoon simondi and 2% incidence of Haemoproteus. Subinoculation of whole blood into Pekin ducklings produced a Plasmodium infection rate of 31%. Females were more frequently infected (12/22) than males (15/68). The parasite was identified as P. circumflexum.
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1 October 1970
Incidence of Malaria in a Wintering Population of Canvasbacks (Aythya valisineria) on Chesapeake Bay
R. M. KOCAN,
J. O. KNISLEY