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A traveler with measles may have exposed people at Dulles International Airport while moving through Terminal A, baggage claim and airport transportation on March 5, Virginia health officials said.

The Maryland resident, who had recently returned from an international trip, passed through the airport between 4 and 9 p.m. The person’s destination of origin, flight and airline were not disclosed.

Health officials are working to identify people who may have been exposed, including passengers on specific flights.

Anyone who may have encountered the traveler at Dulles should watch for symptoms through March 26. Measles symptoms generally appear one to two weeks after exposure and can include fever, cough, runny nose and itchy eyes. A rash may begin at the hairline before spreading across the body.

Measles is caused by a virus that can spread through the air when an infected person breathes or coughs. Although the disease remains rare in the United States, an outbreak that emerged in Texas in late February surpassed 200 reported cases and was linked to the death of a 6-year-old. Officials were also investigating the possible measles-related death of an unvaccinated adult.

The Centers for Disease Control and Prevention issued an alert March 7 with guidance for health professionals and travelers responding to the Texas outbreak. The agency said the risk of widespread infection remained low.

More than 90% of the U.S. population is vaccinated against measles, according to Virginia health officials. Two doses administered during early childhood provide lifetime protection.

Virginia residents with questions about possible exposure can call the health department at (804) 363-2704 or email epi_response@vdh.virginia.gov.

About 800,000 international passengers traveled through Dulles in March of the previous year, according to Metropolitan Washington Airports Authority data.