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December 13th, 2017
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Bots (Gasterophilus)
Bots infect horses in many parts of the country. They have a very interesting life cycle with the adults resembling a honeybee. The larva in the stomach look similar to many free-living grubs.

These larva attach to the lining of the stomach and cause a very small ulcer. When there is a heavy infection these ulcers may join to form a large ulcer. There are indications that if the ulcer is large enough it may cause colic.

Specimen Photos/Illustrations

Ulcer on tongue due to bot larva.
Larva attached to wall of stomach.
Ulcer on gums near teeth caused by bot larva beginning migration to stomach.
Click images for larger view...
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Horsemen's Laboratory
907 Westbrook Drive
Mahomet, Il 61853
Lab Phone: 800-544-0599
Office Phone: 217-586-2004