With nearly 800 cases and rising concern across the Southwest, experts warn the U.S. could lose measles eradication status without higher immunization rates.

The area of Short Creek, which bridges the Arizona-Utah border, has seen nearly 160 measles cases and counting.

A measles outbreak on the Arizona-Utah border is the second largest in the United States in 2025, which has been a record-setting year for measles.

Measles elimination status means a country has not experienced an uncontrollable spread of the virus for at least one year.

Travelers to, from, and within Australia and New Zealand need to be informed and take precautions as the global measles outbreak continues to spread.

Only one person has newly tested positive for measles in South Carolina this week, but an Upstate outbreak could continue to spread, especially with the upcoming holidays, according to the state Department of Public Health.