Mysterious Zika Cases Raise US Mosquito Fears
Florida officials are investigating four cases of Zika that do not appear to be related to travel, raising fears mosquitoes in the US are spreading the virus.
Up to now, the 1,400 infections reported in the US have been linked to people going to countries with Zika outbreaks in South America and the Caribbean.
Two new cases have been announced in neighbouring Miami-Dade and Broward counties, which raise the possibility of local Zika transmission in the US.
They are in addition to two others in the same areas that may also be non-travel related.
