Florida rushes to reassure tourists as 10 more Zika cases confirmed
Florida governor Rick Scott has asked for a federal emergency response team to help the state combat the spread of the Zika virus in the US, saying the number of cases has increased to 14.
The new cases are clustered in the same square-mile neighbourhood in Miami-Dade County identified last week.
Florida health officials said they believe active transmissions of Zika are occurring only in that area.
Officials announced four cases on Friday, believed to be the first people to contract the virus from mosquitoes within the 50 states.
US health officials do not expect widespread outbreaks of the sort seen in Brazil and Latin America.
Although most people who get Zika do not know they are sick, infection during pregnancy can cause babies to be born with small heads and other defects.
More than 1,650 people in the mainland US have been infected with Zika in recent months, nearly all while travelling abroad.
On Friday, Florida agricultural officials immediately announced more aggressive mosquito-control efforts, and Florida politicians rushed to assure tourists it is still safe to visit the state.
The four Florida infections are thought to have occurred in a small area just north of central Miami, in the Wynwood arts district.
The area, known for bold murals spray-painted across warehouses, art galleries, restaurants and boutiques, is rapidly gentrifying and has a number of construction sites where standing water can collect and serve as a breeding ground for mosquitoes.