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The guidance applies to men who have lived in or traveled to Miami-Dade, Broward and Palm Beach counties since June 15. There are 12 sperm donor banks in those counties, the Associated Press reported.
While Zika can be detected in blood donations, there is no good test for Zika in semen, according to the Food and Drug Administration. That agency regulates sperm donations and previously warned sperm banks not to accept donors who have been diagnosed with Zika or been to an area where Zika is common in the past six months, the AP reported.
The last mosquito Zika transmission in Florida was in December, but officials believe mosquitoes will start spreading the virus again this summer.
Last year, 221 people in the continental U.S. got Zika from mosquitoes, and most of those cases were in the Miami area. There is no evidence that mosquitoes in Broward or Palm Beach were spreading Zika, and officials believe infections in those counties occurred in Miami-Dade, according to Dr. Denise Jamieson, head of the CDC's Zika emergency response.
"A lot of times people may not realize when they crossed the county line," she told the AP.
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