Molecular and Morphological Characterization of Sarcocystis Infections in the Muscles of Gray Wolves (Canis lupus) from Minnesota Suggest They May Serve As Reservoirs for Infection in Domesticated Dogs
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Abstract
Sarcocystis infections were found for the first time in the muscles of 3 of 3 gray wolves (Canis lupus) from Minnesota. Two kinds (thin-walled and thick-walled) of sarcocysts were detected, based on the appearance of the sarcocyst wall. In wolf 1, sarcocysts were thin-walled (1 μm) sarcocyst wall, was detected in wolves 2 and 3. Ultrastructurally, the sarcocyst wall had undulating, pleomorphic villar protrusion of type 9c; these sarcocysts were identical to Sarcocystis caninum from the domestic dog. Molecularly, the 2 Sarcocystis species were characterized using 18S, 28S, COI, ITS-1, and rpoB genetic markers. All these markers showed 100% identity to either of the 2 species previously described from the domestic dog. The thick-walled sarococyst corresponded to Sarcocystis caninum, whereas the thin-walled sarcocyst corresponded to Sarcocystis svanai.
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