With summer just around the corner, now is the time to vaccinate horses against Potomac horse fever (PHF).

“Horse owners need to be aware of the disease and its seasonality,” said Julia Wilson, DVM, Dipl. ACVIM, associate professor of large animal medicine at the University of Minnesota.

PHF is a potentially deadly disease that can cause mild depression, anorexia, diarrhea, and abortion in pregnant mares. Some horses also might develop severe toxemia, and up to 40% of horses with PHF will develop laminitis

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