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  WHO says Zika virus spreads explosively, 4 million cases forecast

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  Most U.S. troops fighting Ebola in Africa will come home - Obama

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  NIH says U.S. healthcare worker with Ebola in critical condition

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  Ebola patient's dog euthanized

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  Obama says huge strides made in fight against Ebola

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  Experts meet in Geneva to review Ebola vaccines: WHO

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  CDC worker monitored for possible Ebola exposure in lab error

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