For the first time since last fall, officials in Texas have reported what they believe is a case of mosquito transmission of the Zika virus within the state’s borders.

If correct, it would be the first known instance of local mosquito transmission within the continental United States this year.

The single case, reported in Hidalgo County, on the Mexican border, “was probably transmitted by a mosquito bite in South Texas sometime in the last few months,” the state’s health department said on Wednesday.

The affected person, who was not identified, is no longer capable of transmitting the disease, officials said.