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Schistosomiasis survey: technician sampling weeds

Schistosomiasis survey: technician sampling weeds

M312/0007

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Credit

ANDY CRUMP, TDR, WHO / SCIENCE PHOTO LIBRARY ANDY CRUMP, TDR, WHO / SCIENCE PHOTO LIBRARY

Caption

Schistosomiasis research. A schistosomiasis researcher samples weeds growing around the edge of a lake in Tanzania. Snails found during the survey are taken back to the laboratory for identification. Certain freshwater snails are the intermediate hosts in human schistosomiasis. Schistosomiasis (bilharzia) is a chronic trematode worm infection widespread in tropical countries. Infection occurs from fresh water containing worm larvae emitted by the snails. The worms mature in the veins of the intestines and bladder, producing large numbers of eggs which provoke inflammation and fibrosis which may obstruct blood flow or urine flow.

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