US Measles Cases Hit 35-Year High as Vaccination Rates Wane

The United States has recorded more measles cases in 2026 than in any year since 1991, with over 2,300 confirmed infections nationwide as of late July — surpassing the full-year total for 2025 with more than five months still remaining. Public health officials warn that declining childhood vaccination rates have eroded the community immunity that kept measles eliminated in the country for more than two decades.

According to the Centers for Disease Control and Prevention, 2,318 confirmed measles cases were reported across 45 jurisdictions as of July 23, 2026, with 35 new outbreaks recorded this year alone. A staggering 93% of cases — 2,153 of 2,318 — are linked to active outbreaks. The Johns Hopkins University U.S. Measles Tracker, which updates in real time from state and local data, placed the count at 2,295 as of July 22.

HNGN reported that more measles cases have been documented in the last two years (2025–2026) than in all years from 2000 through 2024 combined, a stark illustration of how quickly the disease has rebounded.

The Vaccination Gap

The surge is directly tied to declining uptake of the measles, mumps, and rubella (MMR) vaccine. National coverage among kindergartners has fallen from 95.2% during the 2019–2020 school year to 92.5% in 2024–2025, dipping below the 95% threshold required for herd immunity. The CDC estimates this left approximately 286,000 kindergartners unprotected during the most recent school year.

Some school districts now report MMR vaccination rates well below 90%, creating pockets of vulnerability that sustain prolonged outbreaks even when national averages appear relatively stable, according to Medical Daily.

Dr. William Schaffner, a professor of preventive medicine at Vanderbilt University Medical Center, described the situation in stark terms to HNGN. “The elimination of measles in the U.S. — once ‘a beacon to the rest of the world’ — is eroding,” he said. “We are trying to turn back the clock as a society to the bad old days.”

Geographic Hotspots

The outbreak is concentrated in several states with significant undervaccinated communities. South Carolina leads with 670 confirmed cases, followed by Utah with 518 and Texas with 182, according to CDC data. Florida and Arizona also report elevated case counts.

Children between the ages of 5 and 19 account for approximately 49% of all confirmed cases, while children under 5 represent about 20% and face the highest risk of hospitalization. Overall, 7% of patients — 151 people — have been hospitalized in 2026. No measles deaths have been reported this year, compared with three deaths during the 2025 outbreak.

Elimination Status at Risk

The United States has held measles elimination status since 2000, meaning the virus was no longer spreading continuously within the country. That designation is now under serious threat. The Pan American Health Organization’s Regional Verification Commission is scheduled to convene in November 2026 to formally review whether the U.S. still qualifies.

The New York Times reported that the current trajectory could produce case totals not seen in the U.S. since the early 1990s, when more than 9,600 infections were recorded in a single year before widespread vaccination drove the disease to historic lows.

Dr. Susan Kressly, a pediatrician quoted by the North Jersey Record, emphasized that the outbreaks are not a failure of the vaccine itself. “The MMR vaccine is incredibly safe and effective — two doses provide 97% protection against measles. The reason we’re seeing outbreaks is not because the vaccine doesn’t work; it’s because not enough children are getting it.”

What Lies Ahead

Public health experts expect case numbers to continue rising, particularly with school reopening in the fall — a period historically associated with increased transmission. The combination of pandemic-era vaccination disruptions, rising vaccine hesitancy fueled by misinformation, and expanded non-medical exemption policies in some states has created what the North Jersey Record described as a “perfect storm.”

Losing elimination status would represent a significant public health setback, affecting international travel protocols and health credibility. The November PAHO review will examine whether continuous domestic transmission of measles has occurred for 12 or more consecutive months, using genomic sequencing to trace viral lineages.

For now, health officials are urging families to verify vaccination records and ensure children receive both recommended doses of the MMR vaccine. With the outbreak showing no signs of slowing, the coming months will determine whether the U.S. can reclaim its hard-won elimination status or watch a once-conquered disease become endemic once again.