By Lise Alves, Senior Contributing Reporter
SÃO PAULO, BRAZIL – The increasing number of registered cases and deaths related to yellow fever in Brazil have led to health officials to step up the vaccination campaigns and the World Health Organization to warn international travelers to be cautious when travelling to Brazil’s most populous state, São Paulo.
“Considering the increased level of yellow fever virus activity observed across the state of São Paulo, the WHO Secretariat has determined that the entire state of São Paulo should be considered at risk for yellow fever transmission,” read an alert . . .
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