US Measles Cases Hit 2,318 — Highest Total Since 1991, CDC Says
- Jul 27
- 3 min read
WHAT HAPPENED: The United States has now recorded 2,318 confirmed measles cases in 2026, surpassing last year's full-year total and reaching the highest level since 1991, according to new data from the Centers for Disease Control and Prevention. The milestone arrives with five months still remaining in the year — meaning 2026 is on pace to shatter the modern record for a disease the country officially declared eliminated in 2000.
It is the second consecutive record-breaking year: the US reported 2,289 confirmed cases in all of 2025, itself a post-elimination high. This year blew past that figure by late July.
WHAT WE KNOW: Of the total, 2,302 cases were reported across 45 US jurisdictions, with 16 more identified among international visitors. The CDC has tracked 35 distinct outbreaks in 2026, and the data shows a strikingly consistent pattern: 93 percent of cases are outbreak-associated, and roughly 93 percent of infections are in people who are unvaccinated or whose vaccination status is unknown.
Geographically, the epicenters are not where many would expect. South Carolina leads the nation with 670 cases, followed by Utah with 518 and Texas with 182 — a reminder that sustained transmission can take hold anywhere community vaccination rates dip below the protective threshold.
BACKGROUND: Measles is among the most contagious diseases known to medicine — one infected person can transmit the virus to 9 out of 10 unprotected close contacts, and the virus can linger in the air for up to two hours after an infected person leaves a room. The MMR vaccine is highly effective, with two doses providing about 97 percent protection. But national kindergarten MMR coverage has slipped to 92.5 percent, below the roughly 95 percent needed for herd immunity, and coverage in some communities is far lower.
The US eliminated homegrown measles transmission in 2000, one of the great public health achievements of the vaccine era. Elimination status means the virus no longer circulates continuously; outbreaks occur only when travelers import it and it finds pockets of unvaccinated people. Two consecutive record years — with multi-state outbreaks burning for months — put that status in genuine jeopardy. If a single chain of transmission is sustained for more than 12 months, the US would formally lose its elimination designation.
REACTION: Public health experts have described the numbers as both alarming and entirely predictable, pointing to years of declining routine childhood immunization, rising exemption rates, and the spread of vaccine misinformation. Pediatricians report spending more time countering vaccine hesitancy than at any point in their careers. State health departments in the hardest-hit regions have opened vaccination clinics and urged parents to check their children's records before the school year begins — the late-summer window is critical, since school reopening in August and September gives the virus dense new networks to move through.
The CDC continues to recommend two doses of MMR for all children, with the first at 12 to 15 months and the second at 4 to 6 years, and urges adults without evidence of immunity to get vaccinated. Officials stress that the vaccine's safety record spans decades and hundreds of millions of doses.
WHAT TO WATCH: The next two months will be decisive. Watch whether case counts accelerate as schools reopen, whether South Carolina's and Utah's outbreaks are declared over or continue into the fall, and whether any single transmission chain approaches the 12-month mark that would end US elimination status. Also watch kindergarten vaccination data for the incoming school year — if coverage falls further below 92.5 percent, experts warn record years could become the norm rather than the exception.
BOTTOM LINE: A disease the United States defeated a generation ago is staging a comeback, and the numbers are no longer ambiguous: 2,318 cases, a 35-year high, two record years in a row, and almost every infection occurring in the unvaccinated. The tools to stop measles have existed for 60 years and remain freely available. Whether the country uses them — before elimination status is lost and record years become routine — is now the central question facing American public health.
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