An infant in King County was identified as the first confirmed measles case in Washington in 2025, following increases in cases in other parts of the United States, county officials said.
There were three cases of measles in King County last year. The new case was confirmed on Wednesday. The infant is suspected to have been exposed to measles during recent travel abroad.
The infant is known to have visited several public locations prior to being diagnosed: the Apple Store at Bellevue Square, Seattle Children's Hospital Emergency Department, Allegro Pediatrics in Bothell, and Northwest Asthma & Allergy Center in Redmond.
All three medical facilities are notifying patients who may have been exposed and providing information about the exposure date and possible symptoms. Symptoms for those exposed would be likely to appear between Feb. 27 to Mar. 18.