Neospora caninum (Apicomplexa) in an Aborted Equine Fetus

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Abstract
Tachyzoites of Neospora caninum were found in sections of lung of an equine fetus aborted 2 mo before term. Individual tachyzoites were approximately 3-5 .times. 2-3 .mu.m, divided by endodyogeny, and stained positively with anti-N. caninum serum but not with anti-Toxoplasma gondii serum. Toxoplasma gondii antibody was not found in the mare''s serum. This is the first report of N. caninum in a horse and indicates that N. caninum can be transmitted transplacentally in equids.