Opinion: America Is Having Its Worst Measles Year in Decades, and It Didn't Have to Happen

Federal data released this month show the United States is on pace for its worst year for measles in more than three decades, and the numbers point less to bad luck than to a series of policy choices that have made the country more vulnerable to a disease it eliminated 26 years ago.

As of Sept. 10, the Centers for Disease Control and Prevention had confirmed 3,294 measles cases in 2026 across 47 states and jurisdictions, according to the agency's own case count. That already exceeds the 2,289 cases recorded in all of 2025, itself a sharp jump from the 285 cases confirmed in 2024. Ninety-five percent of this year's cases are linked to one of 38 separate outbreaks, meaning the disease is not merely appearing in isolated travelers but taking hold and spreading once it arrives.

The reason is not mysterious. Measles is among the most contagious diseases known, and the two-dose measles-mumps-rubella vaccine is about 97 percent effective at preventing it, according to the World Health Organization. Herd immunity against a pathogen this transmissible generally requires vaccination coverage above 95 percent, the threshold the American Academy of Pediatrics cites in its own guidance to pediatricians on school-entry requirements. The CDC's own figures show MMR coverage among American kindergartners has fallen from 95.2 percent in the 2019-2020 school year to 92.4 percent in 2025-2026, a decline that leaves an estimated 280,000 kindergartners nationally without protection.

A choice, not an accident

That decline has tracked closely with an expansion of non-medical exemptions from school vaccination requirements in a growing number of states, alongside cuts to the public health outreach programs that once helped counter vaccine misinformation in under-immunized communities. Texas, one of the states at the center of this year's outbreaks, has posted regular case updates through its state health department as clusters have spread through under-vaccinated communities. A recent editorial in the journal Virulence describing the global resurgence of measles in 2026 noted that outbreaks are concentrated overwhelmingly in places where vaccination coverage has slipped below the threshold needed to prevent sustained transmission, a pattern the research literature has described consistently for years.

None of this required a new virus or a novel failure of medicine. It required only that enough parents, in enough places, opt out of a vaccine that has been in routine use since 1963, and that officials treat the resulting drift in coverage as a matter of individual choice rather than a collective public health failure. The costs of that framing are now measured in case counts that have not been this high since before most of this year's infected children were born.

Measles is not typically fatal in wealthy countries with modern medical care, but it is not benign either: it can cause pneumonia, encephalitis and, rarely, a fatal degenerative brain disease that can emerge years after infection. It also has a well-documented tendency to suppress a child's broader immune memory for months afterward, leaving them more vulnerable to unrelated infections in the meantime.

What should change

Reversing the trend does not require a novel intervention. It requires restoring public health outreach funding that has been cut in recent years, narrowing the broadest non-medical exemption categories that have opened the widest gaps in coverage, and being plain with parents about what a 92.4 percent vaccination rate actually means against a disease this contagious. The alternative is more of what the CDC's own data already shows: a rising, largely preventable case count that will keep climbing for as long as the country treats a solved problem as an open one.