Measles spreads in Oregon

Oregon’s measles outbreak is spreading beyond households, and state health officials say everyday community transmission is becoming more likely. (opb.org) Oregon had recorded 20 known measles cases in 2026 as of April 17, according to State Epidemiologist Dr. Dean Sidelinger. He also reported the state’s first measles hospitalization of the year; that patient has since been discharged and is recovering. (opb.org) The Oregon Health Authority said the first outbreak involving more than one household was identified on April 11 in Clackamas and Multnomah counties. On its public measles page, the agency had listed 14 cases, 13 unvaccinated or with unknown status, and zero hospitalizations as of April 9, showing how quickly the count changed in one week. (oregon.gov) Measles spreads through the air when an infected person breathes, coughs or sneezes, and the virus can remain in the air for up to two hours after that person leaves. The Centers for Disease Control and Prevention says up to 9 in 10 susceptible close contacts can get infected. (cdc.gov) That makes exposure notices at ordinary places more important than a single family cluster. Oregon officials said this month that people may have been exposed at Centennial Middle School in southeast Portland, Mt. Hood Community College’s Gresham campus, and a Legacy GoHealth urgent care in Oregon City. (oregon.gov, opb.org, kgw.com) Oregon launched a wastewater dashboard on February 19 to track measles virus by county, and health officials said the first five confirmed cases likely represented only part of the true spread. Sidelinger said again on April 17 that the reported total almost certainly misses additional infections. (oregon.gov, opb.org) The main protection is vaccination. The Centers for Disease Control and Prevention says one dose of measles, mumps and rubella vaccine is 93% effective against measles and two doses are 97% effective. (cdc.gov) Oregon officials have tied many recent cases to people who were unvaccinated, partly vaccinated, or whose records were unknown. Sidelinger urged parents on April 17 to check their children’s vaccine records and talk with a health care provider if they are unsure. (oregon.gov, opb.org) Measles usually starts with fever, cough, runny nose and red eyes before the rash appears, often 7 to 14 days after exposure. Oregon health officials are asking anyone who may have been exposed to call a provider before showing up in person, so clinics and hospitals can limit new exposures. (cdc.gov, oregon.gov) For now, the state says the risk remains low for most vaccinated Oregonians. The warning is aimed at the gaps: infants under 12 months, people with weakened immune systems, and anyone without measles protection as the outbreak moves into schools, clinics and other daily routines. (opb.org, cdc.gov)