Male partners of such women should either avoid sex during the pregnancy or use condoms to prevent sexual transmission of the virus.
CDC Update, "Florida Department of Health has identified two areas of Miami-Dade County where Zika is being spread by mosquitoes. In addition to the previously identified area in the Wynwood neighborhood, there is now mosquito-borne spread of Zika virus in a section of Miami Beach." Miami/Date County map.
CDC data showing 579 confirmed Zika cases in New York State and even 69 in Pennsylvania and 66 in New Jersey might seem comparable or even worse than the 408 cases reported in Florida, but the raw numbers are misleading - the important number is 14 which is the number of LOCALLY ACQUIRED Zika infections for Florida.
There are NO other locally infected Zika patients in any of the 50 U.S. States, hence no need to warn women to avoid the areas. All of the reported cases outside Florida were people who were infected elsewhere and traveled to those states where the infection was detected in their blood.
See a map and chart at the CDC site for details.
There are active outbreaks in some U.S. territories which should also be avoided by those who might be pregnant.
American Samoa has 44 locally acquired cases, Puerto Rico has 7,855+, and the U.S. Virgin Islands together have 101 cases.