Influence of Isospora Infections on Patency of Avian Lankesterella (Atoxoplasma, Garnham, 1950)

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Abstract
Parasitemia and death from Lankesterella increased when sparrows were caged together with access to fecal contamination. Administration of Isospora oocysts to adult and nestling sparrows and canaries also increased parasitemia and death from Lankesterella. No effect on patency resulted from association with, or oral administra-tion of, mites or by oral and parenteral injection of Lankesterella para-sites from sparrows to canaries. Isospora oocysts from sparrows did not have the marked effect on Lankesterella patency in canaries that occurred in sparrows, although oocysts from both hosts are morphologically similar. Motility of Lankesterella tissue forms is described.

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