Health officials in the United States say there is now enough evidence to conclude contracting the Zika (ZEE-kuh) virus while pregnant can cause severe birth defects, including microcephaly. (micro-SEF-uh-lee)
Zika is at its worst in Brazil, where hundreds of babies have microcephaly, a syndrome where children are born with unusually small heads.
The US Centres for Disease Control and Prevention (CDC) have concluded there is a causal link, but also warns there are many unanswered questions.
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