The United States reached its highest number of measles cases in over 33 years on Monday, hitting 1,277 confirmed cases across 38 states and Washington, D.C. The country reached the highest number of cases of the vaccine-preventable disease since 1992,

Measles cases in the United States are the highest they’ve been since the country eliminated the disease in 2000. The U.S. has reported 1,277 cases since the start of the year, according to NBC News’ tally of state health department data.

U.S. measles cases hit 1,277—the worst outbreak since the disease was declared eliminated in 2000, surpassing 2019's peak.