Bergen County has seven travel-related cases of the Zika virus and Passaic County two, comprising more than half combined of all cases in New Jersey, the state Department of Health reports.
The 15 travel-related cases as of Tuesday are among an estimated 500 nationwide. There were no known cases of anyone infected by a mosquito on the mainland U.S.
Experts are testing speciments for the virus in a laboratory at State Police headquarters in West Trenton, Acting New Jersey Health Commissioner Cathleen Bennett said earlier this week.
"The ability to test residents for Zika and similar viruses will further enhance New Jersey's preparedness and response to this evolving health emergency unfolding in the Caribbean and Central and South Americas," Bennett said.