Health officials say a person in Texas appears to have been infected with Zika after being bitten by a local mosquito, the third such instance this year.
In its latest update, Dallas County Health and Human Services says it is monitoring 13 cases involving either pregnant mothers or infants for possible Zika infection.
Texas health officials have reported what they believe to be the state's first case this year of local Zika virus transmission.
Texas health officials are recommending expanded Zika virus testing for pregnant women in six South Texas counties.
The Centers for Disease Control and Prevention reports that in 2016, about 10 percent of U.S. pregnant women with confirmed Zika virus infection had a fetus or baby with Zika-related birth defects.
Austin health officials say a child born in Travis County with microcephaly has the Zika virus.
Federal health officials say pregnant women should consider postponing travel to Brownsville, Texas, because of concerns about mosquitoes there spreading the Zika virus.
The State of Texas has been given a $5 million grant from the Centers for Disease Control and Prevention to combat the Zika virus.
North Texas mosquito experts believe there will be more cases of people infected with the Zika virus by mosquitoes in Texas.
Tarrant County reported its 25th case of Zika virus on Thursday. All of those people were infected somewhere else and brought the illness back to North Texas.
The mosquito-borne Zika virus usually causes a mild illness but is now suspected in an unusual birth defect and possibly other health issues. The World Health Organization has declared an international emergency as the disease spreads.