Anxiety is mounting across Miami, home to the continental U.S.’s first known cases of Zika virus transmitted by mosquitoes, as the outbreak appears to be spreading, fueling fears that the threat is greater than initially anticipated. Federal and state officials on Friday confirmed a new area of active Zika virus transmission in Miami Beach, with Gov. Rick Scott saying five people were infected with the virus.

At least one other area of Miami-Dade County is also under investigation for another possible cluster, according to people familiar with the investigations. Authorities originally said they believed mosquitoes were spreading the virus only in a roughly one-square-mile area of the Wynwood arts district, north of downtown. Living under the Zika threat there has taken its toll. CONTINUE