Dallas County Health and Human Services yesterday said in a statement that the patient was infected with the virus after having sexual contact with an ill individual who returned from a country where Zika virus is present.

For medical confidentiality and personal privacy reasons, the agency did not provide additional identifying information.

Zika, transmitted primarily through the bite of an infected Aedes species mosquito, is believed to cause birth defects such as microcephaly, or small heads.

Currently, there is no vaccine to prevent or medicine to treat the disease.

About one in five people infected with Zika virus will develop symptoms, which include fever, rash, joint pain, and pink eye.

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