Abortions apparently due to Neospora caninum in two Swiss dairy herds were investigated by means of a PCR and ELISA, and other potential causes were eliminated. In addition, a case-control study of 24 case herds and 24 control herds indicated that N caninum-associated abortions were more likely to occur in herds with antibodies to Coxiella bumetii (with an odds ratio [OR] of 3.38 with a 95 per cent confidence interval [cl] of 1.82 to 6.22), whereas the likelihood was less in herds with antibodies to Leptospira species (OR 0.34, 95 per cent ci 0.13 to 0.75), or in herds with antibodies to bovine viral diarrhoea (BvD) virus (OR 0.75, 95 per cent ci 0.56 to 1.00), or Chiamydia psittaci (OR 0.18,95 per cent ci 0.09 to 0.35), or in herds in which BVD virus had been isolated from an aborted fetus (OR 0.11, 95 per cent ci 0.02 to 0.58).
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