Roundworm-Schistosoma (Skin-Swimmer’s Itch)
Schistosomiasis, also known as bilharziasis, swimmer’s itch or snail fever, is caused by the larvae of blood flukes known as schistosomes. Direct contact with fresh water infested with the free-living form of the parasite known as cercariae. The building of dams, irrigation systems, and reservoirs, and the movements of refugee groups introduce and spread schistosomiasis. Eggs are excreted in human urine and feces and, in areas with poor sanitation, contaminate freshwater sources.