While large redworm have the capability to cause more damage in the horse, their numbers have been vastly reduced over the last 40 years due to modern worming regimes. The small redworm is up to 2.5cm long, thin and usually reddish in colour (the unfed worms appear white). As well as large populations of adult redworm being problematic to the horse, cyathostomes also have an unusual developmental stage, where the larvae of some species burrow into the horse’s gut wall and encyst with the potential of causing serious consequences when they re-emerge. They have a very quick lifecycle (as little as five - six weeks) and reproduce in large numbers 95% of parasite burdens found in horses are small redworm. Small redworm are the most common and arguably most dangerous parasite threat to horse health. There are two types of redworm found in the horse – small and large strongyles.
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