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The World Health Organizations says the Zika virus, which has been linked to brain damage in thousands of babies in Brazil, is likely to spread across nearly all of the Americas. Dr Anthony Fauci, head of the US National Institute of Allergy and Infectious Diseases, says developing a vaccine will take at least a year. (Picture: Female Aedes aegypti mosquito in the process of acquiring a blood meal from a human host. Credit: James Gathany/CDC)
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