Anyone who sat in the Kaiser Permanente Sunnyside Medical Center emergency department waiting room on Aug. 17, between 12:33 p.m. and 2:33 p.m. may have been exposed to measles, the Oregon Health Authority and Clackamas County Public Health announced on Aug. 19.
The facility at 10180 SE Sunnyside Road in Clackamas sits minutes from Lake Oswego, West Linn and Oregon City, where schools are preparing to open for the 2026-27 year in September.
It is the second Kaiser location in Clackamas County linked to a potential measles exposure this month. On Aug. 6, officials identified a separate exposure at the Kaiser Mt. Scott Medical Office at 9800 SE Sunnyside Road between 1:35 p.m. and 3:44 p.m., according to OregonLive.
Lake Oswego School District, West Linn-Wilsonville School District and Oregon City School District are all Clackamas ESD partner districts opening next month, according to the Clackamas ESD 2026-27 Local Service Plan.
What to do if you were there
OHA is advising anyone present during the exposure window to check their vaccination records and watch for symptoms. The MMR vaccine can be given within 72 hours of exposure to prevent infection; immune globulin may be administered within six days.
Kaiser Permanente said it will contact individuals directly who are identified as eligible for post-exposure prophylaxis, according to KOIN.
Measles is airborne. The virus can linger for up to two hours after an infected person leaves a room. Symptoms typically appear seven to 21 days after exposure and often begin with fever, cough, runny nose and red eyes before a rash starts on the face and spreads to the rest of the body. People are contagious from four days before the rash appears until four days after.
Anyone who suspects they have measles should call a health care provider before going to a clinic or hospital. In an Aug. 7 statement tied to the earlier Kaiser Mt. Scott exposure, OHA advised people planning to seek medical care to first call ahead by telephone and create an entry plan so they do not expose others in waiting rooms.
Oregon's outbreak by the numbers
Oregon had 45 confirmed measles cases as of OHA's Aug. 19 count, according to the Nisqually Valley News citing OHA data. That is 14 more than in all of 2024 and dwarfs the single case recorded statewide in 2025.
Most 2026 cases have been reported in Multnomah County, but health officials have detected measles in the wastewater of at least four other counties since Aug. 1, including Washington, Polk, Marion and Klamath. Possible exposures have also been reported in North Portland, Gresham, Beaverton, Southwest Portland and Clark County, Washington.
How to get vaccinated
Two doses of the MMR vaccine are about 97% effective at preventing measles. The disease is particularly dangerous for children younger than 5, pregnant people and those with weakened immune systems.
Clackamas County residents without a primary care provider can schedule an appointment with a Clackamas County Health Center. Multnomah County families can call 503-988-5558 to make a new patient appointment at one of seven primary care clinics or nine student health centers.
OHA recommends parents confirm their children's vaccination records are current before the first day of school.
