"Miami Beach does have a series of characteristics that make it particularly challenging," Frieden said. Possible infections outside Wynwood and Miami Beach also are being investigated. "For this reason, it is possible that other neighbourhoods in Miami-Dade County have active Zika transmission that is not yet apparent," the CDC's statement said. Elsewhere on Friday, the CDC updated its guidance for health care providers caring for infants born to mothers with possible Zika virus infection during pregnancy. About 80 per cent of people infected with Zika virus have no symptoms.

Source: CBC News August 19, 2016 14:14 UTC