The first known case of sexual transmission of the Zika virus in the U.S. was reported in Texas on Tuesday by local health officials. Those officials said it likely was contracted through sex and not a mosquito bite. Two days ago the World Health Organization declared an international public health emergency.
The virus which is thought to cause severe birth defects in thousands of babies in Brazil, is spreading into the Americas.
Dallas County Health and Human Services said it received confirmation of the case in Dallas from the U.S. Centers for Disease Control and Prevention.