Description of Sarcocystis campestris sp.n. (Protozoa



Title Description of Sarcocystis campestris sp.n. (Protozoa: Sarcocystidae): a parasite of the badger Taxidea taxus with experimental transmission to the Richardson's ground squirrel, Spermophilus richardsonii.
Author(s) Richard J. Cawthorn, G. A. Wobeser, A. A. Gajadhar
Journal Canadian Journal of Zoology
Date 1983
Volume 61
Issue 2
Start page 370
End page 377
Abstract Sporulated oocysts (10.1 X 15.3 mu m) and free sporocysts (8.0 X 10.2 mu m, with a large, round sporocyst residuum consisting of a single refractile granule) of Sarcocystis campestris n.sp. were obtained from intestinal scrapings of Taxidea taxus (carcasses frozen 2 years at -20 deg C) from Saskatchewan, Canada. When free sporocysts were given orally to juvenile Spermophilus richardsonii, acute fatal sarcocystosis developed in some of the squirrels after 11 to 13 days. 2nd-generation meronts were present 9 to 12 days after infection in the vascular endothelium of many tissues (especially the lungs). Cysts developed in skeletal muscle, contained metrocytes (7 X 5 mu m) on day 30 and, beginning on day 46, bradyzoites (12.0 X 3.5 mu m) were present. Cysts were macroscopic as early as day 258. Squirrel carcasses containing cysts (76 days after infection) were fed to Sarcocystis-free T. taxus. The prepatent period was 9 days and patency lasted at least 13 days. Both animals were ill early in the patent period and passed unformed faeces during patency..

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