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Seroprevalence of Neospora caninum and abortion in dairy cows in northern Spain
  1. R. Mainar-Jaime, DVM,PhD1,
  2. M. Thurmond, DVM, PhD1,
  3. B. Berzal-Herranz, DVM1 and
  4. S. Hietala, PhD1
  1. 1 Department of Medicine and Epidemiology, and the California Veterinary Diagnostic Laboratory System, School of Veterinary Medicine, University of California, Davis, California 95616- 8737, USA

Abstract

The seroprevalence of Neospora caninum infection was estimated from a sample of 889 cattle from 43 dairy herds in three counties in the Asturias region of Spain. The true prevalence of infection was estimated to be 30-6 per cent (95 per cent confidence interval (ca) 27.6 to 33.6). Seropositivity was associated with abortion during the previous year (odds ratio (OR)=3.31, P<0.001) and was slightly higher among purchased cattle (37.6 per cent), than among cattle raised on the farm (29.1 per cent) (P=0.078). Seropositive cows were more likely than seronegative cows to have had a seropositive dam (OR=2.3, P=0.011), suggesting that congenital transmission contributed to about 56 per cent of the infections. Herds with a true seroprevalence above 10 per cent had more dogs on the farm, than herds with a lower prevalence (P=0.032). The ORs relating abortion to seropositivity in individual herds ranged from 0.7 to 19, indicating that some herds experienced few abortions caused by N caninum, while others experienced more abortions due to the organism. Overall, 38.7 per cent of the abortions were estimated to have been attributable to N caninum.

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