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Can Scientists Prove Zika Virus Causing Birth Defects?

Scientists suspect an outbreak of the Zika virus is behind a surge in a rare birth defect in Brazil. But how are they going to prove it? Authorities in the South American country were quick to make the link last fall. The health minister last week said he was “absolutely sure” that the mosquito-borne virus is a cause.   But others aren't so certain. While the evidence has been mounting, so far it is circumstantial.   “The simple presence of the virus doesn't mean it...

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