A total of 75 trumpeter swans (Olor buccinator (Richardson)) from the Grande Prairie region of Alberta was examined for hematozoa; 26(34.6%) swans were infected with Haemoproteus nettionis. A single infection of Leucocytozoon simondi and two of Plasmodium circumflexum also were recorded. Local, second year(SY) and adult (AHY) female swans had closely similar rates of hematozoan infection; the SY and AHY male swans had substantially higher infection rates than other subgroups.
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