Nearly a year after the Zika virus grabbed global attention, it is still confounding the scientific community.
It may not have wowed Congress, or the countries and foundations that normally fund the World Health Organization's outbreak response efforts, but it has left scientists scrambling for answers to critical questions.
It's been 13 months since obstetricians in northeastern Brazil started noticing babies being born with grossly underdeveloped heads. In the months since, it has become apparent that the condition — microcephaly — is just the most visible form of the devastation that the virus can wreak when it infects the fetus.
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