Abstract
Thirty-four of 42 hearts from apparently normal camels were infested with sarcosporidia. Cysts were invariably found in the papillary muscle of the left ventricular wall; in 12 hearts they were in the right ventricular wall and in 1 heart in Purkinje fibers. None was found in the auricular muscles. An acute non-suppurative focal interstitial myocarditis occurred in association with the sarcocysts in 10 of the affected hearts. This reaction may be caused by a toxin from the cysts or it may be an allergic type of response in a previously sensitized host.

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