July 4, 2019


Potomac Fever is not contagious. It is contracted by coming into contact with worm larva transmitted by snails, insects, and flies laid in particular wet/damp grass and water.

Indications of its presence in horses are as follows:

  • Elevated temperature (over 102)
  • Diarrhea
  • Low White Blood Cell Count
  • Depression

Should your horse exhibit any of the above, contact your veterinarian immediately as its treatable when caught early.

Good horsemanship practice is the key, keep your barn area and ditches as dry as possible and do not graze on damp/wet grass.  Make sure you take temperatures daily.

It’s not unusual during the summer months for the odd horse to contract Potomac Fever.

If your horse exhibits any of the 4 named indications above, don’t wait contact your veterinarian immediately.

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