Vaccines are commonly used in the control of bovine respiratory disease; however, the field performance of these vaccines is poorly understood. We describe an outbreak of infectious bovine rhinotracheitis in a 383-animal beef finishing unit in Scotland four months after vaccination with a live glycoprotein E deleted (marker) bovine herpesvirus 1 (BoHV-1) vaccine. Seroconversion to the vaccine was confirmed in acute sera, and seroconversion to field virus was confirmed in convalescent sera. BoHV-1 was also identified in bronchoalveolar lavage fluid and conjunctival swabs using PCR. This outbreak highlights the importance of the reporting of veterinary vaccine suspected lack of expected efficacy events, as well as the paucity of data available to practitioners relating to the field performance of veterinary vaccines.
- infectious bovine rhinotracheitis (IBR)
- bovine herpes virus (BoHV)
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