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These worms are more of an irritation, than harmful. It is usually an infection in stabled horses, as the eggs cannot survive for long in grass.
Up to 10cm long and white-grey in colour. They have a long tail tapering to a point.
Location In Horse
Lives in colon from where it migrates to rectum to lay eggs, in clumps of 50,000 eggs
Itchy anus causes tail rubbing
The only way to treat pinworm is with anthelmintics (wormers) containing any of the chemicals ivermectin, moxidectin, benzimidazole or pyrantel embonate.
If dung collection rather than chemical treatment is controlling worms then O.equi could develop in stabled horses. The horse should be treated for pinworms twice a year.