Health authorities warned of further spread. Most U.S. measles cases this year involved people 19 and under and those without a confirmed vaccination.
The U.S. registered its first death from measles since 2015 this week, as a child who wasn’t vaccinated died in a measles outbreak in rural West Texas.
An unvaccinated child died of measles in Texas on Tuesday, prompting concerns about low vaccination rates across the Inland Northwest.
Reported cases of the highly contagious disease are likely to grow, officials say.