Oregon health officials say a Multnomah County resident has been diagnosed with measles, marking the first reported case of an infection in the state linked to a recent outbreak in Washington.

It’s not clear where in the county the person lives. The Oregon Health Authority announced Friday four new locations in Gresham, Wood Village and Troutdale where people may have been exposed to measles on Sunday and Wednesday.

The Multnomah County exposure locations have been identified as:

Legacy GoHealth Urgent Care , 22262 Northeast Glisan Street in Gresham from 9 a.m. to 11:30 a.m. Sunday, Jan. 20.

Fred Meyer , 22855 Northeast Park Lane in Wood Village from 11 a.m. to 12 p.m. Sunday, Jan. 20.

Gresham Troutdale Family Medical Center , 1700 Southwest 257th Drive in Troutdale from 12:30 p.m. to 2 p.m. Wednesday Jan. 23.

Walgreens, 25699 Southeast Stark Street in Troutdale from 1 p.m. to 2:30 p.m. Wednesday Jan. 23.

Authorities announced other locations last week, including the Moda Center during a Portland Trail Blazers game on Jan. 11.

There are 31 people as of Friday who have been diagnosed with measles in the Vancouver-area and King County in Washington. State Gov. Jay Inslee declared a state of emergency Friday due to the spread of the contagious disease.

Measles is highly contagious and can linger in the air for up to two hours after an infected person has left the area. The state’s emergency declaration says that anyone who hasn’t been vaccinated and comes in contact with an infected person will likely get the disease.

Clark County Public Health has a daily call center for questions about the outbreak at 360-397-8021.

The Oregon Health Authority advises people who have questions about the measles to visit their website or call their county health department:

Clackamas County: 503-655-8411

Marion County: 503-588-5621

Multnomah County: 503-988-3406

Washington County: 503-846-3594

— Everton Bailey Jr.