EN
Antibodies to the coccidian Neospora caninum were measured in serum samples derived from dairy cows in Poland that had aborted in 1998-2000, using an ELISA. Antibodies to N. caninum were found in 7 of 45 (15.6%) cows. The presence of specific antibodies in 15.6% of the tested animals indicates that the aborted cows were exposed to N. caninum and neosporosis should be considered in differential diagnosis of bovine abortion in Poland.