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. Once in the blood vessels, the larvae will continue their migration throughout the body to various organs causing damage to the blood vessels along the way. This can cause anemia or blockage of blood flow caused by the detachment of blood clots from the vessel wall resulting in tissue death.
During the infective phase of S. vulgaris life cycle, mature larvae in a horse's intestines will migrate into nearby blood vessels. Once inside the vessels, they continue their journey throughout the body to various organs, causing harm by damaging blood vessels and potentially blocking blood flow due to detached clots from vessel walls leading to tissue death.