CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
Bilharzia infection. Light micrograph of human ureter tissue that contains numerous eggs from Schistosoma flukes. The ureters are tubes that carry urine from the kidneys to the bladder. The Schistosoma sp. flukes (small parasitic worms) cause the tropical disease bilharzia (schistosomiasis). Eggs are expelled into lakes and rivers in urine from infected humans. The eggs hatch into larvae, infect aquatic snails, and develop into cercariae. After leaving the snail, the cercariae infect humans who enter the water. The mature adult form lives in bladder veins, where the females lay many hundreds of eggs that accumulate in body tissues and cause damage.
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