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FILE - In this Friday, Feb. 12, 2016 file photo, Lara, who is less then 3-months old and was born with microcephaly, is examined by a neurologist at the Pedro I hospital in Campina Grande, Paraiba state, Brazil. 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. But experts say the evidence is still circumstantial. Several studies are underway in Zika outbreak countries to see if the mosquito-borne virus is the actual case. (AP Photo/Felipe Dana, File)

FILE - In this Friday, Feb. 12, 2016 file photo, Lara, who is less then 3-months old and was born with microcephaly, is examined by a neurologist at the Pedro I hospital in Campina Grande, Paraiba state, Brazil. 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. But experts say the evidence is still circumstantial. Several studies are underway in Zika outbreak countries to see if the mosquito-borne virus is the actual case. (AP Photo/Felipe Dana, File)

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