Two new diving duck hosts for Plasmodium circumflexum.
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Biomedical subjects
J O Knisley
Publications and source records attributed to J O Knisley.
The bufflehead (Bucephala albeola): a new host record for Plasmodium.
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Animals↗
Challenge infection as a means of determining the rate of disease resistant Trichomonas gallinae-free birds in a population.
Trichomonas gallinae-free pigeons and mourning doves were infected with the Jones' Barn strain of T. gallinae to determine the rate of disease resistant T. gallinae-free birds in each population. Although all birds became infected 88% of the pigeons were resistant to trichomoniasis while 82% of the mourning doves were resistant. It was concluded that these birds had been previously infected and spontaneously lost their trichomonad fauna while retaining their resistance to fatal infection.
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Incidence of malaria in a wintering population of canvasbacks (Aythya valisineria) on Chesapeake Bay.
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.
Animals↗
Plasmodium elongatum from a penguin.
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Animals↗
Subinoculation as a technique in the diagnosis of avian Plasmodium.
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Animals↗