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Can Vaccinated Horses Still Get Sick?

A veterinarian lists the reasons a vaccine might fail to protect a horse against disease.
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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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Written by:

Elizabeth Davis, DVM, PhD, Dipl. ACVIM

Elizabeth Davis, DVM, PhD, Dipl. ACVIM, is a professor and section head of equine medicine and surgery at Kansas State University’s College of Veterinary Medicine. She is also the Associate Dean of Clinical Programs. Her research focuses on immunology and effective vaccination strategies and clinical pharmacology.

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