The reappearance of the Aedes mosquitoes, coupled with suitable climatic conditions, have triggered a Zika virus epidemic in Brazil and is affecting hundreds of thousands of people across South America. While the effects on adults are relatively minor, the virus can cause a condition known as microcephaly in which babies to be born with smaller than normal head and brains. What efforts are being made to control this outbreak? Are populations in North America at risk? (3:30 min.)

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