Blood Parasites of the Canada Goose, Branta canadensis interior

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Abstract
In a study of blood smears from 353 Canada geese (B. canadensis interior) collected at Horseshoe Lake Game Refuge, Illinois. Leucocytozoon simondi was found in 32 (9.1%), Haemoproteus sp. in 5 (1.4%), Plasmodium sp. (probably P. circumflexum) in 1 (0.3%) and microfilariae in 4 (1.1%). 2 types of unsheathed microfilariae were found, one 65 and the other 332 [mu] long. Leucocvtozoon was found in 27.6% of 76 juvenile geese, 5.4% of 112 yearlings, and 3.0% of 165 adults. Haemoproteus was found in no juveniles, 0.9% of the yearlings, and 2.4% of the adults. Microfilariae were found in 1.3% of the juveniles, 0.9% of the yearlings, and 1.2% of the adults. Haemoproteus hermani Haiba, 1948 is a synonym of H. anatis Haiba, 1946.