Florida health officials are investigating a Zika infection in Miami-Dade County that may be the first acquired within the state, according to an announcement late Tuesday.

Health officials reported they are conducting an epidemiological investigation in collaboration with the federal Centers for Disease Control and Prevention.

No details were provided regarding the potential mode of transmission. Zika is primarily transmitted by the bite of infected Aedes aegypti and Aedes albopictus mosquitoes, though the CDC has also reported cases of the virus spreading through blood transfusions, from pregnant mothers to their newborn children, and by sexual transmission.

Florida health officials reported seven new cases of Zika infection on Tuesday, all acquired by people while traveling outside the country. The cases included three in Broward County, three in Orange County and one in Miami-Dade. Miami-Dade has the state’s largest number of Zika infections, with 88 people having contracted the virus this year.

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