The travel advisory appears to be the first time that officials have recommended that a certain group of people not travel to an area within the continental United States, according to Frieden.
The CDC also recommends:
All pregnant women in the United States should be assessed for possible exposure to Zika.
News of the first local cases of Zika in Florida came on Friday (July 29), when three men and one woman in the Miami-Dade area were found to be infected with the virus.
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Although officials have already taken steps to reduce the population of mosquitoes in the area, surveys of mosquito counts are still showing moderately high levels of the insects, Frieden said. This could be because the mosquitoes are resistant to the type of insecticide that is being used, although more tests are needed to confirm this. In addition, it's possible that there are still small areas of standing water where mosquitoes can continue to lay eggs, Frieden said.
Of the 10 new Zika cases, six people did not have symptoms, but were identified after officials went door-to-door to collect and test urine samples from residents in the area.
Original article on Live Science.
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