Schistosome parasites. Coloured scanning electron micrograph (SEM) of adult female (yellow) and male (pink) Schistosoma mansoni parasitic worms, cause of the disease bilharzia (schistosomiasis). These parasites live in the veins of the intestines and bladder of humans. Females live in a groove on the males' backs. They feed on blood cells, attaching themselves to the vessel walls by a pad on their heads (male's at upper right). Females lay eggs continuously, which are excreted in faeces and urine. They develop in water snails into forms which infect humans through contact. Bilharzia can cause liver and kidney damage. It is treatable with drugs. Magnification: x50 at 6x7cm size.

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