Description of Sarcocystis rauschorum sp.n. (Protozoa



Title Description of Sarcocystis rauschorum sp.n. (Protozoa: Sarcocystidae) with experimental cyclic transmission between varying lemmings (Dicrostonyx richardsoni) and snowy owls (Nyctea scandiaca)
Author(s) Richard J. Cawthorn, A. A. Gajadhar, R. J. Brooks
Journal Canadian Journal of Zoology
Date 1984
Volume 62
Issue 2
Start page 217
End page 225
Abstract Free sporocysts of a Sarcocystis-like organism (11.6 x 9.2 micro m with a diffuse residuum of numerous small refractile granules) from intestinal scrapings of an N. scandiaca from Saskatchewan, Canada, were orally administered to laboratory-reared D. richardsoni. Merants were present in hepatocytes after 7 days. Cysts of the parasite (named S. rauschorum n.sp.) developed in striated muscle and contained metrocytes (4.6 x 3.8 micro m) 14 days after infection; bradyzoites (6 x 2 micro m) were present as early as day 28. Cysts obtained on day 84 were not macroscopic (greatest diameter 80.9 micro m, least 70.9 micro m) with walls 0.35-0.70 micro m thick. Rats, mice, Peromyscus leucopus, Clethrionomys gapperi and Lemmus sibiricus were not suitable intermediate hosts. Carcasses of D. richardsoni containing cysts (57 and 84 days after infection) were fed to 3 Sarcocystis-free N. scandiaca. The prepatent period was 7 days and patency lasted 12-19 days. Sporogony occurred in the lamina propria throughout the length of the small intestine. Free sporocysts (10.4 x 8.2 micro m with a compact residuum of numerous refractile granules) from experimentally infected N. scandiaca were infective to D. richardsoni..

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