The Centers for Disease Control and Prevention (CDC) reports at least 171 confirmed measles cases in the United States so far this year, detected in nine states including Arizona, Florida, Georgia, North Carolina, Ohio, Oregon, South Carolina, Utah and Virginia. Public health departments said South Carolina and Utah are experiencing notable outbreaks: South Carolina’s cluster centers on Spartanburg County, and Utah’s outbreak — which began in June last year — has surpassed 200 cases. State officials linked Utah’s infections to the same viral strain involved in a Texas outbreak last year. Federal and state health agencies warn the pattern raises concern that measles could regain sustained transmission in the U.S.
Key Takeaways
- At least 171 measles cases confirmed nationally so far this year across nine states: AZ, FL, GA, NC, OH, OR, SC, UT and VA.
- South Carolina has an active outbreak concentrated in Spartanburg County; officials reported at least 124 new cases in the state since last Friday.
- Utah’s outbreak began in June last year and had topped 200 cases as of Tuesday, with 147 cases located in the southwest region.
- About 95% of nationally confirmed cases are among people who are unvaccinated or whose vaccination status is unknown, per CDC data.
- CDC reports 2% of cases occurred in people with one MMR dose and 2% in those with two doses; roughly 1% of U.S. measles patients have been hospitalized.
- In 2025 the U.S. recorded 2,242 measles cases (the highest since 1992); nearly 50 outbreaks were reported that year compared with 16 in 2024 and 4 in 2023.
- At least three measles deaths were recorded in 2025: two unvaccinated school-aged children in Texas and one unvaccinated adult in New Mexico — the first U.S. measles deaths in a decade.
Background
Measles was declared eliminated in the United States in 2000, defined as the absence of continuous disease transmission for more than 12 months. That status reflects vaccine-driven interruption of endemic spread, but maintaining elimination depends on high population immunity and rapid outbreak control. Coverage with the measles, mumps and rubella (MMR) vaccine has slipped in recent years: 92.5% of kindergartners received the MMR vaccine in the 2024–2025 school year, down from 95.2% in 2019–2020.
Low or uneven vaccination coverage creates pockets of susceptibility that allow imported or reintroduced measles strains to spark sustained clusters. Public health surveillance detected widespread activity in 2025, when more than 2,200 cases were reported across over 40 states. Many recent outbreaks have been traced to single introductions that then spread in under-immunized communities, illustrating how local declines in coverage can produce rapid national ripple effects.
Main Event
State health officials report that South Carolina’s outbreak began in early October and has concentrated cases in Spartanburg County near the North Carolina border. Health department briefings this week said the state logged at least 124 new cases since last Friday, driving the statewide increase. Local officials have deployed case investigation teams and targeted vaccination clinics to affected communities.
In Utah, cases have accumulated since June of the prior year; state data released this week put the total above 200, with 147 cases in the southwest and additional spread northward. The Southwest Utah Department of Public Health confirmed to reporters that genomic analysis links the Utah infections to the same strain identified in a Texas outbreak the prior year, indicating a common chain of transmission rather than multiple unrelated introductions.
Over the last few days health departments in Georgia, Oregon and Virginia each reported their first confirmed measles cases of 2026, expanding the list of states with active cases. Nationally, the CDC’s updated accounting shows the majority of cases are in people under age 19; hospitalizations remain relatively rare but are occurring in about 1% of patients.
Analysis & Implications
The recent case counts and geographic spread raise the risk that the United States could lose its measles elimination designation temporarily if continuous transmission persists across jurisdictions for more than a year. Public health officials say the driving force is low vaccine uptake in specific communities and gaps in routine pediatric immunization that leave clusters vulnerable to importations.
From a health-systems perspective, rising case loads require more resources for contact tracing, isolation support, and surge vaccination clinics. Even with a small hospitalization rate, the absolute number of severe cases grows with larger outbreaks, stressing emergency departments and pediatric care, particularly in regions with limited capacity.
Policy implications include renewed emphasis on school entry vaccination requirements, outreach to hesitant families, and improved outbreak preparedness across state lines. Federal and state agencies may consider targeted funding for community immunization campaigns and incentives to raise kindergarten coverage back toward pre-pandemic levels near 95%.
Comparison & Data
| Metric | Value |
|---|---|
| Confirmed U.S. cases so far this year | 171 (nine states) |
| Utah cumulative cases (as of Tuesday) | >200 (147 in southwest) |
| U.S. cases in 2025 | 2,242 (highest since 1992) |
| MMR effectiveness | 1 dose: 93% • 2 doses: 97% |
| Kindergartner MMR coverage (2024–25) | 92.5% |
The table places the current cluster counts alongside recent annual totals and vaccination metrics. While current-year national totals (171) remain well below 2025’s 2,242 cases, active outbreaks in multiple states and suboptimal immunization coverage indicate potential for further growth without swift containment.
Reactions & Quotes
“Our outbreak is the same strain that was in the Texas outbreak.”
David Heaton, Southwest Utah Department of Public Health
Heaton’s statement links the Utah spread to a previously documented chain of transmission, suggesting genomic continuity rather than independent introductions. That pattern helps investigators map transmission routes and prioritize vaccination and containment measures.
“About 95% of nationally confirmed cases are among people who are unvaccinated or whose vaccination status is unknown.”
Centers for Disease Control and Prevention (CDC)
The CDC’s data underscore the central role of under-vaccination in current outbreaks and shape recommendations for targeted immunization drives and school-based verification of vaccine records.
Unconfirmed
- Whether current chains of transmission will extend long enough and broadly enough to permanently restore endemic measles in the U.S. remains uncertain and depends on future case trends and control measures.
- Not all reported cases have publicly released genomic sequencing; broader linkage of strains to the Texas outbreak is confirmed for southwest Utah but is not yet established for every state’s cluster.
- The precise drivers of local declines in MMR coverage (for example, access barriers versus hesitancy) vary by community and require further investigation before assigning causal weight.
Bottom Line
At least 171 confirmed cases in nine states and rising outbreak activity in South Carolina and Utah highlight that measles remains a clear and present public-health risk when vaccine coverage falls below protective thresholds. The majority of cases occurring among unvaccinated people reinforces that established vaccines remain the primary tool to prevent spread and severe outcomes.
Public health response now should focus on rapid case investigation, targeted vaccination in affected communities, and rebuilding routine immunization coverage for children entering school. Policymakers and health officials will need to balance immediate outbreak control with longer-term strategies to restore and sustain population immunity.