Measles cases have been reported by 39 states and jurisdictions in the United States, the worst outbreak since 2019.

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.

The University of Texas and Austin Public Health created a measles simulator for school districts and private schools around the county to better understand their risks.

As the measles outbreak continues in West Texas and two neighboring states, The Dallas Morning News will keep this page updated every Tuesday with information on confirmed cases.

While measles symptoms typically resolve in a few weeks, the virus can cause pneumonia, making it difficult for patients, especially children, to get oxygen into their lungs. It may also lead to brain swelling, which can cause lasting damage, including blindness, deafness and intellectual disabilities.

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

Due to the ongoing U.S. measles outbreak, a Texas man worried that his young son was at risk and took him to get vaccinated. The cost of the shot? $1,400.

The U.S. thought it had eradicated measles 25 years ago. Now the highly contagious disease is back, spiking to more than 1,200 cases already in 2025.

Measles cases in the U.S. are at their highest in more than three decades. The U.S. Centers for Disease Control and Prevention says the U.S. has 1,288 cases since the beginning of the year.