With the onset of the most serious EHV-1 outbreak Europe has seen in years, horse owners and caretakers are reminded of the necessity of vaccinating horses against the deadly disease. Questions have arisen regarding the best timing of vaccine administration — should the EHV vaccine be given concurrently with other AAEP-recommended core vaccines or should the vaccines be split into multiple doses?
Research suggests that vaccinations for equine influenza virus (EIV) and equine herpesvirus types 1 and 4 (EHV-1 and EHV-4) can safely be administered on the same day without compromising the horse’s immune response.
Scientists from the Irish Equine Centre in Kildare divided 30 healthy horses into two groups to test the efficacy of the vaccines alone and used in tandem. The first group received the EIV vaccine and then a combination EHV-1 and EHV-4 vaccine two weeks apart. The second group was given both vaccines on the same day. Blood samples were taken from all horses before and after the vaccinations to measure antibody levels to EIV, EHV-1 and EHV-4.
Results showed that the horses vaccinated for both EHV and EIV on the same day had slightly higher antibody response to EIV vaccines than those horses that were vaccinated two weeks apart. There was no significant difference in EHV-1 and EHV-4 antibody response between the two groups.
The study team concludes that administering EIV and EHV-1 and -4 concurrently will not compromise the horse’s immune system response.
Read more at EQUUS.
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