A. CRUMP, TDR, WHO / SCIENCE PHOTO LIBRARY A. CRUMP, TDR, WHO / SCIENCE PHOTO LIBRARY
Filariasis control. Man spraying insecticide on vegetation near to houses to kill the mosquitoes that transmit lymphatic filariasis. This disease is due to parasitic worms that cause the body's lymph vessels to become blocked. Lymph fluid then accumulates in surrounding tissues, a condition known as oedema. Repeated infection may result in elephantiasis as the affected part of the body, commonly a limb, becomes massively enlarged. The disease is treated with drugs. Photographed in Samoa in 1999.
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