Someone who traveled to Portland earlier this summer was infected with measles, and health officials are working to notify people who may have been exposed to the virus.

The Oregon Health Authority on Saturday said the traveler was in the Portland area July 30 to Aug. 6. Officials confirmed the case Friday.

The highly contagious virus spreads easily to those who aren't vaccinated, the Health Authority said. It spreads through the air after someone who's infected coughs or sneezes, the agency said.

People who have measles can spread the virus before showing symptoms, the agency said, and the virus can linger in the air after an infected person has left the area.

Most people in the area have been vaccinated and have a low risk, the Health Authority said. The agency said unvaccinated people who were in the below locations may have higher risk.

July 30, Portland International Airport, 2:15-3:45 p.m.

July 31,

Aug. 1,

Aug. 2, MAX Red Line, Beaverton Transit Center to Pioneer Square, 12:30-1 p.m.

Aug. 2, MAX Red Line, Pioneer Place to Beaverton Transit Center, 5:30-6 p.m.

Aug. 5,

Health officials expect any newly-infected people to show symptoms over the next two weeks, the Health Authority said in a news release.

The agency said there's no connection between the case and other cases in Multnomah County in June and July.

Symptoms include coughing, fever, runny nose and a rash that typically appears first on the head and spreads to the rest of the body.

The virus can lead to ear and lung infections, diarrhea and possibly brain swelling if it isn't treated.

If you think you are infected, call a doctor or emergency room first before visiting to avoid exposing people in the waiting room to the virus. Questions about the virus can be referred to local county health departments.

Multnomah County (503-988-3406)

Clackamas County (503-655-8411)

Washington County (503-846-3594)

Clark County (360-397-8182)

— Jim Ryan

Molly Harbarger of The Oregonian/OregonLive staff contributed to this report