Potomac horse fever

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

Medical Definition of Potomac horse fever 

: 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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