According WHO, "Since December 2016, Brazil is experiencing an upsurge of yellow fever virus activity.
Between 1 December 2016 and 30 June 2017, 1659 epizootics in non-human primates were registered in 21 states. On 9 September 2017, the government of Brazil declared that seasonal yellow fever virus activity has subsided.
Following the 2017 winter season in the Southern hemisphere, an increased yellow fever virus activity was again observed.
Considering the increased level of yellow fever virus activity observed across the state of São Paulo, the WHO Secretariat has determined that, in addition to the areas listed in previous updates, the entire state of São Paulo should also be considered at risk for yellow fever transmission.
Consequently, vaccination against yellow fever is recommended for international travellers visiting any area in the state of São Paulo.
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