Atlas of livestock parasites
digitized collection of microscopical preparations

Atlas of Parasites Contents Information sources Glossary Administration

Strongylus vulgaris



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Large strongyles with length 1.5-4 cm; greyish-red worms with well developed buccal capsule in its base with two tooth-like inside projections.


In fresh carcasses, worms are found attached to the mucosa of the caecum and colon, they feed on mucosal epithelium and suck blood.

Life cycle:

Direct, by ingestion of infected grass, hay or water. Egg to L1 24-48 h, hatching; L1 to L3 (ensheathed) 6-7 days. Longevity up to 1.5-3 years.
Strongylus vulgaris larvae enter the mucosa of the large intestine (3rd moult) and arterioles of the submucosa, migrate along the arterial intima to the cranial mesenteric artery and its main branches where they stimulate thrombus formation and settle; several months later larvae develop to young adult (4th moult) and retum to the wall of the caecum and large intestine via blood where they form nodules; juvenile adults then migrate to the intestine lumen and become egg-laying adults by about 6 months p.i.


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