Humans aren't typically infected by the animal version. Instead, "bladder worm" often refers to Urinary Schistosomiasis , caused by Schistosoma haematobium . These worms live in the blood vessels surrounding the bladder.
Parasites often have complex life cycles that involve "middlemen" or intermediate hosts. The Pet Perspective (Dogs and Cats) bladder worm
For humans, the path is different. Infection usually happens through contact with . Small larvae released by freshwater snails can penetrate human skin during swimming or bathing. Once inside, they travel to the veins of the bladder to lay eggs. Signs and Symptoms: What to Watch For Humans aren't typically infected by the animal version