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Andie Vaught grasps a stress toy in the shape of a truck as she prepares to have blood drawn as part of a clinical trial for a Zika vaccine at the National Institutes of Health in Bethesda, Md., in November 2016.
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It's a bit of a paradox, but researchers say they need Zika virus to re-emerge this year so they can test vaccines designed to defeat it.
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