Description of a species of Sarcocystis (Apicomplexa

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Title Description of a species of Sarcocystis (Apicomplexa: Sarcocystidae), a parasite of the northern saw-whet owl, Aegolius acadicus, and experimental transmission to deer mice Peromyscus maniculatus
Author(s) R. H. Espinosa, M. C. Sterner, J. A. Blixt, Richard J. Cawthorn
Journal Canadian Journal of Zoology
Date 1988
Volume 66
Issue 10
Start page 2118
End page 2121
Abstract Sporocysts of Sarcocystis were recovered from the intestinal mucosa of A. acadicus from Yellowstone National Park, Wyoming, USA. Sporocysts measured 12.0 x 9.7 micro m (9.6-14.0 x 8.0-12.0 micro m; n = 100). Doses of 0, 500, and 2500 sporocysts were administered orally to 5 P. maniculatus and 5 Swiss-Cox white mice. At necropsy, 28 days pi, deer mice administered 500 and 2500 sporocysts had sarcocysts in skeletal muscles and cardiac muscle. White mice were negative at all dose levels. Sarcocysts had a thin wall (<1 micro m) that consisted of a primary cyst wall and a coarse granular layer composed of 36.6-nm granules (25.6-51.2 nm; n = 11). Thickness of the primary cyst wall was 62.5 nm (38.4-116.1 nm; n = 10). Metrocytes were 2.3 x 1.7 micro m (1.5-3.5 x 1.2-2.5 micro m; n = 25). Bradyzoites were 5.2 x 1.1 micro m (4-7 x 1-2 micro m; n = 25). There is no previous report of a Sarcocystis-like organism with A. acadicus as definitive hosts and P. maniculatus as the intermediate host..

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