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[Correspondence] Yellow fever outbreaks, vaccine shortages and the Hajj and Olympics: call for global vigilance

The identification in China of 11 non-immunised travellers from west Africa with yellow fever elevated global attention on this vaccine preventable disease that puts about 1 billion people in 46 countries at risk.1–3 Yellow fever is an acute mosquito transmitted viral haemorrhagic disease with a case fatality rate of 15–50% and no cure. On May 19, 2016, WHO declared yellow fever outbreaks a “serious public health concern”.2