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Mosquitoes in the continental United States may now be spreading the Zika virus. Health officials in Florida said Wednesday they were investigating two Zika cases that could have been spread by local mosquitoes, in addition to the two similar cases they announced last week. None of the infected individuals has been confirmed to have acquired the virus from mosquitoes, but it seems increasingly likely that a local outbreak is occurring. (Joseph, 7/27)

Two more possible non-travel-related cases of Zika virus are being investigated in South Florida, the Florida Department of Health confirmed Wednesday. The new cases are in Miami-Dade and Broward counties, the same areas where health officials began investigating two similar cases last week. The health department began going door-to-door in the area where the cases were found to determine if anyone else is infected. Officials are also collecting mosquitoes in the area for testing. (Ochoa, 7/27)