ANDY CRUMP, TDR, WHO / SCIENCE PHOTO LIBRARY ANDY CRUMP, TDR, WHO / SCIENCE PHOTO LIBRARY
Shanty town. Pigs foraging near a polluted drainage channel in a favela (shanty town) in Brazil. These conditions allow mosquitoes and other blood-sucking insects to breed rapidly, which increases the spread of diseases such as malaria and filariasis.
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