U.S. Measles Cases Hit 5,182 as Status Decision Looms

Michael Osterholm, director of the Center for Infectious Disease Research and Policy at the University of Minnesota, said revoking elimination status would merely recognize conditions already present for months.

“When a semi hits your car at 60 miles an hour at an intersection, you don’t need more assessments showing you’ve had an accident,” Osterholm said.

Bottom line: The case count and deaths show that elimination no longer describes U.S. measles conditions.

Why is vaccination coverage falling?

Around the country, vaccination rates have declined for years. The share of children receiving the mumps, measles and rubella vaccine, known as MMR, has fallen below the 95 percent level needed to sustain herd immunity, a population-level barrier against widespread transmission.

The CDC says 92.4 percent of kindergartners received the measles vaccine in 2026, down from 95.2 percent in 2020. Rates vary by state, and 18 states have MMR coverage below 90 percent. Idaho reported 75.2 percent.

Statewide averages can hide sharply different local conditions and pockets where few people are protected. A January study in Nature Health found numerous counties with MMR coverage below 60 percent.

Osterholm said averages obscure those gaps. In Minnesota, he said, some schools had vaccination levels of 80 percent while some school districts were at 40 percent. He compared averaging such divergent rates to a person with their head in a freezer and feet in an oven.

Bottom line: Statewide averages conceal communities with far too few vaccinated children.

Where does responsibility lie?

Many public health experts blame the Department of Health and Human Services, or HHS. Jacobs described the department under Robert F. Kennedy Jr., a longtime vaccine critic, as an epidemiological crime scene.

Kennedy has occasionally urged parents to get their children the MMR vaccine. He has also recommended ineffective treatments for measles and has spent years casting doubt on vaccine effectiveness and safety.

Jacobs said Kennedy has blamed parents who did not vaccinate their children during COVID. His 18 months in office, she argued, gave him ample time to build a rigorous vaccination program; instead, he could barely make clear that MMR vaccination is the only effective way to prevent measles.

HHS did not immediately respond to a request for comment.

Jacobs also said social media had supercharged longstanding anti-vaccine sentiment. She linked the escalation to the rise of Facebook and said there was no way to stop it.

Bottom line: Official vaccine doubts and online anti-vaccine sentiment have compounded declining coverage.

How large could the outbreak become?

More than 40 percent of this year’s U.S. cases occurred in people aged 20 or older. Overall, 96 percent of cases involved people who were unvaccinated or whose vaccination status was unknown, suggesting that many affected adults likely missed vaccination as children.

Canada provides both a warning and a measure of scale. Last year, PAHO revoked Canada’s elimination status after the country recorded more than 5,000 cases in a population of 40 million.

With a U.S. population of 350 million, Osterholm said similar rates would produce more than 50,000 measles cases a year. Canada also offers hope: Jacobs noted last month that its outbreak had been declared over.

Bottom line: At U.S. population size, Canada’s case rate would become a much larger national outbreak.

Can health authorities stop it?

For the United States to reach the same point, state and federal health authorities need urgent action. Jacobs warned that measles appears first among vaccine-preventable diseases because it is so contagious.

Other illnesses are already simmering in the background, she said, and falling vaccination rates can let them spread rapidly through a population. Without a strong response, she warned, more infectious disease outbreaks could follow.

Bottom line: Urgent vaccination action by state and federal authorities is needed to stop outbreaks and protect against other diseases.