Officials said that 30 of the cases involved people who have not had a measles immunization. Almost of the cases are children. Measles cases surged globally in 2017 due to gaps in vaccine coverage. But there has been a recent rise in unvaccinated children.
The proportion of children receiving no vaccine doses by 2 years old rose from 0.9% among those born in 2011 to 1.3% among those born in 2015, the CDC reported in October.
