[1] This nematode is considered to be one of the "most pathogenic" of the large strongyles subphylum and is distributed worldwide, wherever there are grassland and temperate environments.

[3] During the infective stage of the S. vulgaris life cycle, the larvae that have matured in the intestinal tract of the horse will migrate into the surrounding blood vessels.

In mild cases the most common clinical signs are weight loss, compromised performance, and a dull hair coat.

[6] Other clinical signs can range from diarrhea, weakness, anorexia, anemia if there are significant blood loss and abdominal discomfort.

Here the eggs grow and develop into the infective larval stage that is specific to the large strongyle parasite.

[8] The adults of S. vulgaris are primarily found in the cecum and colon of infected equids and it is here that the females will lay their eggs.

[12] As foals can be extremely susceptible to this parasite, it is best to treat broodmares before they give birth and move them to uninfected pastures to avoid transfer.