So far cases outside of Latin America and the Caribbean, where the virus is prevalent, have been spread by travel to that region or sexual transmission.
The four Florida cases have raised the possibility that mosquitoes in the US have begun to carry the virus.
Zika causes only a mild illness in most people but the virus has been linked to severe brain defects in newborns.
Read More: http://www.bbc.com/news/health-36910940
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