Trypanosoma avium in the Blood and Bone Marrow from 677 Colorado Birds

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Abstract
A comparison was made of the incidence of Trypanosoma avium in the blood and bone marrow of 877 Colorado birds in 139 species. Of 549 birds in 96 species, 334 had positive marrow and 215 had negative marrow. All 128 birds in 43 species showed no T. avium in the marrow. Of the 677 birds, only 33 had a trypanosome parasitemia, including 4 (2 species) which had negative marrow. Individuals with trypanosome-positive marrow had nearly twice the incidence of other parasites in the blood (215 birds) as had those with negative marrow (115 birds). Forty-three of the 96 species with positive marrow represent new host records for T. avium. The sharp-tailed grouse, one of the two species which had flagellates in the blood only, also is a new host record.