The Zika virus, believed to be linked to the serious birth defect microcephaly, presents a "formidable" challenge that will be hard to stamp out, World Health Organization chief Margaret Chan said Wednesday.
"Things could get worse before it gets better," she said in Rio de Janeiro after a fact-finding mission to Brazil, the epicenter of a global health scare.
"Things could get worse before it gets better," she said in Rio de Janeiro after a fact-finding mission to Brazil, the epicenter of a global health scare.
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