A health worker stands in the Sambadrome as he sprays insecticide to combat the Aedes aegypti mosquitoes that transmit the Zika virus, in Rio de Janeiro. Inspectors are spraying the insecticide around the Sambadrome, the outdoor grounds where thousands of

A health worker stands in the Sambadrome as he sprays insecticide to combat the Aedes aegypti mosquitoes that transmit the Zika virus, in Rio de Janeiro. Inspectors are spraying the insecticide around the Sambadrome, the outdoor grounds where thousands of dancers and musicians will parade during the city's Carnival celebrations.

Credit:

Catherine Osborn

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