Sarcocystosis: a clinical outbreak in dairy calves

Science  25 Mar 1977:
Vol. 195, Issue 4284, pp. 1341-1342
DOI: 10.1126/science.402695


Death and illness in a pen of eight yearling dairy heifers was caused by the protozoan parasite Sarcocystis. All animals had weight loss, weakness, marginal anemia, and elevated serum enzymes. Affected animals had high hemagglutinating antibody titers to Sarcocystis antigen. Affected tissues of the two animals that died demonstrated schizonits and young cysts during pathologic examination. The resident farm dog was shedding Sarcocystis sporocysts and was incriminated as the source of infection.