Measles, a highly contagious but preventable disease, is resurging in pockets of the United States, a warning of the dangers of the strengthening anti-vaccine movement.

The Centers for Disease Control and Prevention has recorded more cases this year than the 58 tallied in all of 2023, although the agency is not expected to release exact numbers until Friday. On Monday, the agency advised health care providers to ensure that unvaccinated patients, especially those traveling internationally, stay updated on their immunizations.