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Three years later: What we've learned to prevent another Zika outbreak

Three years ago, the Zika virus caused widespread uncertainty and fear, and the hundreds of children born with the associated birth defects are permanently disabled. CBS News chief medical correspondent Dr. Jon LaPook has been reporting on the virus since the height of the outbreak in 2016. He reflects on the situation then and explains the progress that has been made since on CBSN.
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