Health officials in Florida are baffled by four cases of the Zika virus that don’t appear to be travel related.
The cases, detected in Miami-Dade and Broward, raise the possibility that mosquitoes in the US have begun to carry the virus, which has been linked to severe brain defects in newborns.
So far, cases outside of Latin America and the Caribbean have only been due to people travelling to that region, or have been sexual transmitted.
According to the BBC, scientists will now investigate the mysterious cases by surveying an area within a 135-metre radius, which is the flying radius of mosquitoes.
