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  • 1 Intervet Schering-Plough Animal Health Wim de Körverstraat 35 NL-5831 AN Boxmeer The Netherlands
  • 2 Intervet SA Beaucouzé France
  • 3 CEBIPHAR Fondettes France
  • 4 Intervet Italy S.r.l. Peschiera Borromeo (MI) Italy
  • 5 Faculty of Veternary Medicine Parma Italy
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The efficacy of an inactivated bovine respiratory syncytial virus (BRSV) — bovine parainfluenza type 3 (PI3) — Mannheimia haemolytica ( Mh ) combination vaccine was examined in two field studies. Calves were vaccinated (i) with the inactivated vaccine, (ii) a modified live/killed viral combination vaccine, or (iii) left unvaccinated. The efficacy of the vaccines was judged by the (i) number of treated animals, (ii) number of individual antibiotic treatments per calf and (iii) mortality rates. After vaccination with the inactivated vaccine, the number of calves requiring antibiotic treatment was significantly lower than in the unvaccinated group (odds ratios: 0.26 first study and 0.53 second study), but differences between vaccination with live/killed combination vaccines and controls were not significant (odds ratios: 0.56 and 0.90, respectively). In both studies, a number of unvaccinated controls died due to respiratory disease (4.6% first and 6.7% second study). By contrast, none of the animals vaccinated with the inactivated vaccine died in the first study and only 3.3% in the second study. The mortality rates for the groups vaccinated with the live vaccine (1.3% and 7.8%) were similar to the unvaccinated controls. In summary, these data demonstrate the efficacy of the inactivated vaccine under field conditions.

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