Officials at the Centers for Disease Control and Prevention says mosquitoes appear to be spreading the Zika virus in Brownsville, Texas.

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The CDC has received reports of people contracting at least five mosquito-borne cases of Zika in the city, and it has designed the city as a “yellow area,” or an area in which “the local spread of Zika has been identified but there is not yet any evidence of widespread, sustained local spread,” according to a Zika outbreak notice.

The CDC is recommending that pregnant women consider postponing travel to Brownsville.

Brownsville is across the Rio Grande from an area in Mexico where Zika is spreading through mosquitoes, and it is in one of the poorest areas in the United States.

About one-third of the adults and half of the children in the region have no health coverage.

Zika can cause brain damage in children and temporary paralysis in adults.

Florida reported dozens of locally acquired Zika cases this summer and fall, but aggressive mosquito control efforts and the arrival of cooler weather ended the stream of new case reports coming out of Florida.

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