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A boy cries as he receives a vaccine against yellow fever at a public health center in Sao Paulo, Brazil, Tuesday, Jan. 16, 2018. The World Health Organization announced Tuesday that it now considers all of Sao Paulo state at risk for yellow fever, recommending that all international visitors to the state be vaccinated. (AP Photo/Andre Penner)

A boy cries as he receives a vaccine against yellow fever at a public health center in Sao Paulo, Brazil, Tuesday, Jan. 16, 2018. The World Health Organization announced Tuesday that it now considers all of Sao Paulo state at risk for yellow fever, recommending that all international visitors to the state be vaccinated. (AP Photo/Andre Penner)

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