Medical Dictionary

Potomac horse fever

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noun Po·to·mac horse fever \pə-ˈtō-mək-, -mik-\

Medical Definition of Potomac horse fever

  1. :  an often fatal disease of horses that is marked by fever, loss of appetite, diarrhea, and laminitis, that is caused by a bacterium of the genus Ehrlichia (E. risticii), and that was discovered in the region of the Potomac River in Maryland but is much more widespread—called also Potomac fever

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