MONTGOMERY COUNTY — The Montgomery County Public Health Department confirmed three cases of measles on July 21, 2026. The individuals contracted measles after being exposed to a confirmed case from a person who traveled from out of state.

None of the individuals who contracted measles had been vaccinated. The department issued guidance for residents concerned about potential exposure or symptoms.

The agency advises individuals who think they have measles or have been exposed to isolate themselves and call their healthcare provider before arriving for testing. This protocol helps prevent further transmission within medical facilities and the broader community.

The agency states that the measles, mumps, and rubella (MMR) vaccine provides long-lasting protection against all strains of measles. Two doses of MMR vaccine are about 97% effective at preventing measles.

The Centers for Disease Control and Prevention recommend children receive one dose of MMR vaccine at 12 to 15 months of age and another at 4 to 6 years. These guidelines aim to maintain high immunity levels across the pediatric population.

Measles was declared eliminated from the United States in 2000. The recent cases in Montgomery County represent a breach of that status linked to international or interstate travel.

PureSource News previously reported an outbreak of measles in Utah. This earlier outbreak illustrates the potential scale of transmission when vaccination rates decline in specific regions.

Research titled Measles Outbreak of Unknown Source—Shelby County, Tennessee, April to May, 2016 was published in the Pediatric Infectious Disease Journal. The study documents historical challenges in containing the virus within domestic populations.