Most cases of measles in the United States from January 1 through June 30 . According to the CDC , one to three out of every 1,000 children in the United States who get measles will die from the disease , even with the best of care . Last highest year was 2011 , when there were 21 cases . Nearly two - thirds of cases occur in countries where many people do n't vaccinate . Nearly 40 % of children under the age of five who get measles have to be hospitalized .
Most cases of measles in the United States from January 1 through June 30 . Last highest year was 2011 , when there were 21 cases . Nearly two - thirds of cases occur in countries where many people do n't vaccinate . Nearly 40 % of children under the age of five who get measles have to be hospitalized .