Parasites: Small Strongyles

Horses October 11, 2011 Print Friendly and PDF

The small strongyle is considered to be the most common internal parasite of horses. The adult form of all strongyles (large or small) infects the cecum and ventral colon of the horse.

When large numbers of larvae invade the intestine, the horse may become clinically sick, showing signs of:

  • Fever
  • Diarrhea
  • Loss of appetite
  • Weight loss
  • Colic
  • Possibly death

With chronic infections, recurrent colic is a major indicator of the parasite. Small strongyles can be diagnosed on fecal flotation tests.


For more information see:

Strongyles in Horses

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USDA / NIFA

This work is supported by the USDA National Institute of Food and Agriculture, New Technologies for Ag Extension project.