The measles outbreak centered in the South Plains region soared past a combined 500 cases in Texas, New Mexico and Oklahoma on Friday, according to health officials. Texas has seen 481 measles cases amid the outbreak that began in late January,

Already, the U.S. has more measles cases this year than in all of 2024, the U.S. Centers for Disease Control and Prevention has said. Other states with outbreaks — defined as three or more cases — include New Mexico, Kansas, Ohio and Oklahoma. Since February, two unvaccinated people have died from measles-related causes.

Measles outbreaks are surging in 5 U.S. states, with over 400 cases in Texas and two deaths. Here’s what to know.