U.S. Measles Cases Shatter Record as Vaccination Rates Keep Falling

More measles cases have been recorded in the past two years alone than in the entire 25-year span from 2000 through 2024 combined, federal health data show.

The United States has logged more measles cases in the last two years than in all of 2000 through 2024 combined.
Declining childhood vaccination rates are driving the resurgence, public health officials say.
Measles was declared eliminated in the U.S. in 2000 after decades of mass immunization.
The MMR vaccine remains more than 97 percent effective against the virus when two doses are administered.
Federal and state health agencies are under pressure to reverse the vaccination slide before the trend worsens.

The United States has recorded more measles cases in the last two years than in all 25 years from 2000 through 2024 combined, according to federal health data reported Friday by The New York Times.

The milestone marks a dramatic collapse of a disease the Centers for Disease Control and Prevention declared eliminated from the country in 2000 following decades of mass immunization campaigns.

Falling childhood vaccination rates are the primary driver, public health officials say. Clusters of unvaccinated children — concentrated in communities where vaccine hesitancy has grown — have provided the virus with enough susceptible hosts to sustain outbreaks that were once quickly extinguished.

The measles-mumps-rubella vaccine carries an efficacy rate above 97 percent with two doses. Health officials say the barrier to stopping the current surge is not supply or access in most affected areas — it is refusal.

The record arrives as federal public health agencies face funding cuts and leadership vacancies that critics say have slowed outbreak response and undermined routine immunization messaging.

State health departments in several affected regions are expected to announce expanded vaccination outreach efforts in the coming weeks. A CDC advisory committee is scheduled to review immunization coverage data next month.