King County, Washington reports its fifth measles case this year, an unvaccinated infant who traveled internationally and visited Seattle-Tacoma International Airport and Seattle Children's Hospital while infectious. Public health officials have identified potential exposure locations and urge anyone present at those times to monitor for symptoms. This case is unrelated to previous ones. The highly contagious disease can lead to serious complications, emphasizing the importance of MMR vaccination, especially before international travel.

Prepared by Olivia Bennett and reviewed by editorial team.