Diarrhea is a leading cause of disease in foals, affecting about 6% per year. In foals 7 days old and younger, it causes about 25% of disease. But diarrhea itself has many causes. One of the more worrisome causes to veterinarians is equine rotavirus (ERV) infection, which causes illness in nearly 100% of infected foals, and has high mortality rates in neonates and untreated cases.
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