The Florida Department of Health yesterday announced five cases of local Zika virus transmission in a new area of about one square mile in Miami-Dade County. Among other actions, the Centers for Disease Control and Prevention and Florida health officials recommend that pregnant women avoid travel to the newly designated area, in addition to the previously identified designated areas in Miami-Dade County, or take steps to avoid mosquito bites. As of Oct. 12, 128 locally transmitted cases of the mosquito-borne virus had been reported in the continental U.S., all of them in Florida. For more information on Zika, which can cause microcephaly and other birth defects in pregnant women, visit http://www.cdc.gov/zika and http://www.aha.org/zika.