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Serological evidence of Leptospira interrogans serovar Bratislava infection and its association with abortions in cattle in northern Spain
  1. R. Atxaerandio, DVM, PhD1,
  2. G. Aduriz, DVM, PhD1,
  3. I. Ziluaga, BSc1,
  4. J. I. Esteban, BSc1,
  5. L. Maranda, DVM, MSc2 and
  6. R. C. Mainar-Jaime, DVM, PhD3
  1. 1Department of Animal Health, Instituto Vasco de Investigación y Desarrollo Agrario-NEIKER, Berreaga 1, Derio (Bizkaia) 48160, Spain
  2. 2Department of Population and Environmental Health, School of Veterinary Medicine, Tufts University, 200 Westboro Road, North Grafton, MA 0153, USA
  3. 3Department of Veterinary Microbiology,Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Drive, Saskatoon SK S7N 5B4, Canada


A cross-sectional study was carried out in the Basque Country of Spain to determine the seroprevalence of 10 Leptospira serovars in a population of dairy cattle with poor fertility, and a case-control study was carried out in another northern area to investigate the role of Leptospira interrogans serovar Bratislava in abortions. L Bratislava was the most prevalent serovar in the cross-sectional study, with 25·4 per cent of the cows testing positive in the microagglutination test when a cut-off of 1:10 or higher was applied, followed by Leptospira Hardjo (8·2 per cent), Leptospira Pomona (7·7 per cent), Leptospira Autumnalis (0·7 per cent) and Leptospira Copenhageni (0·1 per cent). In the case-control study the seroprevalence of L Bratislava was significantly higher among the cows which had aborted when a titre of 1:300 or more was used as a cut-off (9·7 per cent v 3·4 per cent, P=0·008); 69 per cent of the L Bratislava-infected cows that had aborted apparently aborted as a result of the infection.

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