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[Comment] Yellow fever vaccine supply: a possible solution

The global threat of the emerging epidemic of yellow fever in Angola1 is underscored by the recent spread of similar Aedes aegypti mosquito-borne viruses including dengue, chikungunya, and now Zika. Since their emergence in the 1950s, dengue virus infection has been reported from more than 128 countries, the chikungunya virus has been reported from over 60 countries,2,3 while yellow fever, first identified as a viral infection in 1900, has been reported from more than 57 countries and is on the move once again.