Strongyloides stercoralis

Strongyloides stercoralis. Third-stage, filariform (infective) larva in fecal culture (iodine stain, low power). The third-stage larva is much longer and more slender than its rhabditoid stage (500-630 mm by 15 mm). It is easily recognized by its long esophagus-equal in length to the intestine-and by its blunt, notched tail. This stage normally occurs only in soil or in cultured feces.