Schistosome parasites. Computer-enhanced light micrograph of adult female (mauve) and male (red) Schistosoma mansoni parasitic flukes, cause of the disease bilharzia (schistosomiasis). Their heads are at upper left. They live in veins in the human intestines and bladder. Females live in a groove on the males' backs. They fix themselves to blood vessel walls and feed on blood cells. Females lay eggs continuously, which are excreted in faeces and urine into lakes and rivers. In water snails, they develop into forms which can infect humans through the skin. Bilharzia is endemic in tropical countries, and can cause liver and kidney damage. It is treatable with drugs. Magnification unknown.

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