Can Vaccinated Horses Still Get Sick?
Age, vaccine history, and concurrent health issues can affect immune response to vaccination. | Photo: Alexandra Beckstett/The Horse

Q. This fall I saw reports about horses getting infected with diseases like Eastern equine encephalitis, even though they were up to date on their vaccinations. Sometimes the horses even died from their infections. Why would vaccinated horses still get sick?

—Carol, via e-mail

A

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