The spread of mosquito-born Zika virus, which has been linked to birth defects in children of infected women, has led to travel advisories for pregnant women and, in some countries, advice that women delay pregnancy entirely. What is Zika, and how can countries fight it? Joy Cardin talks to UW-Madison’s Kristen Bernard about how Zika is spreading, the challenges it poses, and how big a problem it may become in the U.S.
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