(Reuters) - A traveler who recently returned to the Houston area from Latin America has a confirmed case of Zika, a virus born by mosquitoes, Harris County, Texas, health officials said.

The U.S. Centers for Disease Control said on Tuesday it has confirmed 24 cases of the disease among returning U.S. travelers since it was first reported in 2007, and is still receiving specimens for testing from travelers who recently became ill.

There is no indication that mosquitoes in the continental United States are spreading Zika. But in December Puerto Rico, a U.S. territory, confirmed the first locally acquired case of Zika virus in a person who had not traveled outside the island.

Zika virus outbreaks have occurred in Africa, Southeast Asia and the Pacific Islands, and have been reported in some countries in the Americas, the CDC said. It is transmitted by Aedes species mosquitoes, which also spread dengue and chikungunya viruses and are common in Texas, Florida and elsewhere in the United States.

Zika is usually a mild illness with fever, rash and joint pain. There is no preventive vaccine, according to the CDC.

The Zika virus has gained attention recently because Brazil is investigating a possible link between the infection and cases of infants born with microcephaly, abnormally small head size associated with incomplete brain development, the CDC said.

(Reporting by Fiona Ortiz; Editing by Dan Grebler)