Urinary symptoms may include frequent urination, painful urination, and blood in the urine. Heavy infestation may cause fever, chills, lymph node enlargement, and liver and spleen enlargement. Illness is not due to the presence of the adult worms in the body, but rather the number of location of the eggs that they lay. Likely areas include the bladder, rectum, intestines, liver, portal venous system, spleen, and lungs. The adult worm then migrates to the anatomic area of its preference, depending on which of the 5 species is involved. Schistosomula are able to travel through blood and lymphatics to the lungs and liver where they mature into the adult form of the worm. The cercariae penetrate the skin of bathers in lakes and ponds where snails abound and cause a dermatitis often referred to as "swimmer's itch." The cercariae then mature into another larval form known as schistosomula. Cercariae are released by the freshwater snails and swim freely in open bodies of water. Cases of schistosomiasis begin when the body is invaded by the parasite in its infective stage, known as cercaria. Schistosomes cause the disease schistosomiasis also known as Bilharziasis and Snail fever. What diseases are caused by Schistosomes? The larval forms of the worm live in freshwater snails. A schistosome is a parasitic trematode worm also known as a blood fluke.
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May 2023
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