Potomac horse fever, a potentially fatal disease, has been reported among horses in the St. Louis, Mo., area in unusually high numbers. Philip Johnson, BVSc, MRCVS, MS, Dipl. ACVIM, a veterinarian at the University of Missouri College of Veterinary Medicine who is specializing in equine medicine and surgery, said he has treated six cases of Potomac horse fever this summer and is aware of a

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