Florida health officials have confirmed the first cases of local transmission of the Zika virus in the United States.
Florida Governor Rick Scott said that the four cases involve three men and one woman. He did not say whether the woman was pregnant.
Health officials believe that the area of active transmission is limited to a one-square-mile area near downtown Miami.
"While no traps tested positive for the virus, the DOH is aggressive testing people in areas to ensure there are no other cases of this virus," Scott said.
Pregnant women are at the greatest risk for complications due to the virus, because it can cause devastating birth defects.
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