Internal Parasites of the Horse
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Internal parasites are a threat to the health of horses and may cause irreparable damage. Parasites are small organisms living a portion of their life cycle within the internal organs, body cavities and tissues inside the horse. There are more than 150 internal parasites; however, only a few commonly cause significant health problems.
The common class of internal parasites causing health problems for horses is nematodes such as large and small strongyles, ascarids, and tapeworms. Other less harmful parasites like pinworms and botfly larvae are also typically considered when applying parasite control.