Texas reported a locally transmitted case of the Zika virus on Monday, making it the second U.S. state believed to have mosquitoes that spread the disease.

Lab tests confirmed last week that a woman who lives in Brownsville, Texas, was infected with the virus, state health officials said in a statement.

The woman had not recently traveled to Mexico or any other region with an ongoing Zika outbreak. The statement also said she was not pregnant, a significant detail because infection during pregnancy can lead to serious brain defects in fetuses.