Why This Matters
The United States has just recorded more measles cases in 2026 than in all of 2025, with the calendar year not yet two-thirds complete. With peak summer travel season underway and August and September historically among the most active months for viral spread, public health officials say the number will continue climbing.
For the approximately 44 jurisdictions where cases have been confirmed, the immediate concern is not evenly distributed. The communities most at risk are those where school-age vaccination rates have fallen below the 95% threshold needed to maintain herd immunity. In those areas, one traveler returning with measles can set off a chain of exposures in classrooms, places of worship, and health-care waiting rooms before anyone knows an outbreak has begun.
The case surge is also arriving at a moment when multiple key federal health positions, including the CDC director and surgeon general positions, remain vacant, raising questions about the depth of the national response infrastructure.
What We Know So Far
The Johns Hopkins University U.S. Measles Tracker confirmed 2,295 measles cases as of July 22, 2026, surpassing the 2,289 cases recorded for the entire year of 2025. This is the highest annual total since the disease was declared eliminated in the United States in 2000, and the highest since 1991.
The CDC's official count, updated as of July 16, stood at 2,260 confirmed cases reported across 44 jurisdictions. The CDC figure runs slightly behind the Johns Hopkins total because the CDC updates its national tally once per week, while the Hopkins tracker incorporates data directly from state and local health departments in real time.
Of the CDC-confirmed cases, 93% (2,108 of 2,260) are linked to an active outbreak. Thirty-four new outbreaks have been recorded in 2026 alone. Six percent of patients, representing 146 people, have been hospitalized. No measles deaths have been reported in 2026, compared with three deaths recorded in all of 2025.
The current count remains well below the 9,600-plus cases recorded in 1991, before widespread vaccination drove measles to historic lows. But surpassing the 2025 full-year total before August means the final 2026 number could approach levels not seen since before the elimination era.
Where the Risk Is Highest
South Carolina leads all states with 670 confirmed cases, followed by Utah with 518 and Texas with 182. Florida and Arizona also appear among the jurisdictions with elevated case counts, according to Johns Hopkins tracker data.
These states share a documented pattern: school districts and religious communities with MMR vaccination coverage well below the 95% herd-immunity threshold. A single lapse in coverage in a densely connected community is enough to sustain prolonged transmission chains, particularly when an index case involves international travel.
The Johns Hopkins International Vaccine Access Center notes that nearly all confirmed cases have occurred in people who were unvaccinated or under-vaccinated. The age distribution is notable: roughly 20% of 2026 cases are in children under five, about 50% are in people aged 5 to 19, and approximately 30% are in adults 20 and older.
That last figure is particularly significant. Adult measles cases reflect years of accumulated under-vaccination in certain communities, not simply a recent shift in attitudes toward childhood immunization.
What Doctors and Experts Say
Dr. William Moss, a professor of epidemiology at the Johns Hopkins Bloomberg School of Public Health, said the surge reflects a pattern years in the making.
"This has been years of undervaccination in some communities," Moss told The Washington Post. "This has been years in the making. It's not just the result of one outbreak."
Moss also cautioned against framing the entire outbreak through the lens of recent political debates over vaccines. The age breakdown, he noted, is the stronger indicator, showing that vulnerability has been building in pockets across the country for a long time, independent of any single policy moment.
Public health experts at KFF have noted that the metrics tracking in 2025 and 2026 are "notably worse" than both the elimination period of 2001 to 2011 and the 2019 outbreak that previously threatened U.S. elimination status.
What the Evidence Shows and What It Does Not
The 2,295 confirmed cases tracked by Johns Hopkins are laboratory-confirmed reports from state and local health departments, not estimates or projections. They represent real, verified infections.
What remains formally undetermined is whether the United States has lost its measles elimination status. Elimination requires that no uninterrupted domestic transmission has occurred for 12 consecutive months. The Pan American Health Organization's Regional Verification Commission is scheduled to formally review the U.S. elimination status in November 2026.
Whole-genome sequencing of the D8-9171 measles lineage, which has been circulating since at least January 2025, will be central to that determination. That review could result in the United States losing elimination status for the first time since the designation was granted in 2000, a significant global public health designation with implications for international travel, trade, and health credibility.
MedicalDaily Evidence Check
- Data type: Laboratory-confirmed case surveillance (national notification system)
- Source: CDC ArboNET / Johns Hopkins U.S. Measles Tracker
- Data through: July 22, 2026 (Hopkins); July 16, 2026 (CDC)
- What it shows: 2,295 confirmed cases, the highest annual count since 1991
- What it does not prove: Formal loss of elimination status; PAHO review in November will make that determination
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What readers should know: Nearly all cases are in unvaccinated or under-vaccinated individuals; two MMR doses remain the most effective protection
Who Faces the Greatest Risk?
Health officials say the groups most at risk include:
- Unvaccinated or under-vaccinated children and adults
- Infants younger than 12 months who are too young to receive the MMR vaccine
- Pregnant women who lack documented immunity
- People with weakened immune systems, including those on certain cancer treatments or immunosuppressive drugs
- Travelers returning from or going to countries with active measles circulation
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Residents of communities where vaccination coverage falls below 95%
Symptoms and Warning Signs to Watch For
Measles symptoms typically appear seven to 14 days after exposure. They may include:
- High fever (sometimes above 104°F)
- Runny nose
- Cough
- Red, watery eyes (conjunctivitis)
- Small white spots inside the mouth (Koplik's spots)
- A red, blotchy rash that usually begins on the face and spreads downward over several days
Mild cases should be reported to a health-care provider by phone before any in-person visit, to prevent further spread in waiting rooms and clinical settings. Severe symptoms, including difficulty breathing, severe headache, seizure, or confusion, require urgent medical evaluation.
Measles can cause serious complications, including pneumonia, encephalitis, and permanent hearing loss, particularly in young children and immunocompromised individuals.
What You Can Do Now
- Verify your vaccination status and your children's records. Two doses of the MMR vaccine are needed for full protection. If you are unsure, contact your doctor, pharmacist, or local health department.
- If you are traveling this summer, check the CDC Travelers' Health page for destination-specific measles risk.
- If you believe you or your child has been exposed to measles, call your health-care provider before visiting a clinic or emergency room.
- Parents of infants younger than 12 months who plan international travel should consult a clinician; an early MMR dose may be recommended starting at 6 months, followed by the standard two-dose schedule.
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Check your county or state health department dashboard for local outbreak notifications.
Cost and Access: What Patients Should Know
For uninsured or underinsured individuals, the MMR vaccine is available at no cost through the Vaccines for Children (VFC) program, which covers children through age 18 who qualify. Adults without insurance can access low-cost vaccination through federally qualified health centers, local health department clinics, and many pharmacy chains.
People who are unsure of their vaccination history can receive a blood test called a titer test to check for measles immunity. This test is covered by most insurance plans. If immunity is confirmed, no additional doses are needed.
What Happens Next
The CDC is expected to release updated case totals on its next scheduled Thursday update. The Johns Hopkins tracker updates continuously as state and local data become available.
The most consequential near-term milestone is the PAHO Regional Verification Commission review in November, which will determine whether the United States retains its measles elimination status. That review will consider the volume and transmission patterns of 2025 and 2026 cases, specifically whether continuous domestic transmission has occurred for 12 or more months.
MedicalDaily will update this report as case counts continue to rise.
The Bottom Line
The United States is recording measles cases at the highest rate in 35 years, driven by pockets of under-vaccination that have been building for years. The risk is not uniform: the vast majority of infections continue to occur in people who are unvaccinated or missing one dose of the MMR vaccine. For fully vaccinated individuals, protection remains strong. For those with incomplete vaccination records or any uncertainty about their immunity status, now is the right time to check and, if needed, get vaccinated.
