PORTLAND, Ore.—Oregon Health Authority (OHA) and Washington and Multnomah County health officials are warning the public about two locations where people may have been exposed to measles.  People might have been exposed if they were at the following locations at these dates and times:  Randall’s Children Hospital Emergency Department waiting room, 2801 N Gantenbein Ave., Portland:  Between 8:10 p.m. and 10:30 p.m., Thursday, July 23; Between 10:51 p.m. and 12:55 a.m., Friday, July 24; Between 11:36 a.m. and 2:11 p.m., Saturday, July 25; Providence St. Vincent Medical Center, East Pavillion Medical Office Building lobby, elevators and seventh floor, 9155 SW Barnes Road, Portland, between 10:20 a.m. and 12:55 p.m. Tuesday, July 28.  People who were at these locations during these dates and times should immediately contact their health care provider and let them know they may have been exposed to someone who has measles. The health care provider can determine whether you are immune to measles based on your vaccination record, age, or laboratory evidence of prior infection.  Families without a primary care provider can establish care at any of Multnomah County's seven primary care clinics or nine student health centers (based at high schools but open to anyone ages 5-18) by calling 503-988-5558 to make a new patient appointment.