Measles Cases Are Rising in the U.S. as Outbreaks Spread

ByBrian “Weence” Bateman

CDC says 2026 measles cases are still climbing, and most are tied to outbreaks. Here’s what the latest data means for families, schools, workplaces, and communities—and why vaccination coverage still matters.

Measles is still spreading in the United States, and the latest CDC data show that most 2026 cases are linked to outbreaks. That matters because outbreak-associated cases can grow quickly in places where vaccination coverage is low or where people are in close contact.

CDC says its counts are provisional, so the numbers can change as more reports come in. Even so, the trend is clear: measles is finding gaps in protection.

What the latest CDC data show

As of May 28, 2026, CDC reported 1,983 confirmed measles cases in the U.S. this year. The agency said 93% of those cases were outbreak-associated, and it noted 30 outbreaks so far in 2026. CDC also says its national page reflects only confirmed cases reported to the agency by Thursday at noon, and that state health departments may have newer local counts.

CDC also reports that kindergarten MMR coverage fell from 95.2% in the 2019-2020 school year to 92.5% in 2024-2025. That gap matters because measles can spread when it gets into communities with pockets of under-vaccinated people.

Why outbreaks keep happening

CDC points to three main reasons: lower vaccination coverage in some communities, more chances for importations from countries where measles is circulating, and close-contact settings such as travel, schools, camps, and other group gatherings.

In plain language, measles does not need much room to spread. When enough people are protected, outbreaks are harder to sustain. When coverage slips below the level needed for community protection, measles can move quickly through households, classrooms, and workplaces.

What the West Texas report adds

A CDC report in the May 28 issue of MMWR adds more detail from the 2025 West Texas outbreak. In the first three months of that outbreak, 325 cases were reported in the South Plains region, and the hospitalized patients with available vaccination records were unvaccinated or had unknown vaccination status.

CDC said about one third of hospitalized patients had bacterial or viral coinfections, and the report noted pneumonia, dehydration, hypoxia, and ICU admission among the complications seen in hospitalized patients. The report also suggests measles was uncommon among people who had received at least one MMR dose, and that vaccinated cases are typically milder.

The report has limits, though. It is based on hospitalized patients in one region, and CDC says mild cases were likely undercounted. That means the hospitalization pattern may not describe every outbreak in the same way.

What wastewater monitoring can and cannot tell us

CDC has also begun posting wastewater data for measles. That system can help show community-level risk and may pick up virus before people seek care or get tested.

But wastewater is a signal, not a diagnosis. It cannot tell you who is infected, and CDC says the data may change as more reports are reviewed. It is best used alongside case counts and local health department updates.

Why this matters beyond the headline number

Measles is not only a childhood illness or a school issue. Outbreaks can disrupt families, create missed work and school days, and put infants, pregnant people, older adults, and people with weakened immune systems at higher risk for serious complications.

Associated Press reporting on a recent South Carolina outbreak showed the public cost can be significant too, with state officials estimating response costs at $2.1 million after the outbreak ended.

What readers can do

For families, schools, and workplaces, the most useful next step is to check vaccination records and follow local public-health guidance during any outbreak response. Schools and employers should also pay attention to notices from state and local health departments, since those agencies often have the most current local information.

People who think they may have measles, or who were exposed and develop fever, rash, cough, runny nose, or red eyes, should contact a clinician or local health department before going in person so precautions can be arranged. Anyone with trouble breathing, dehydration, confusion, or other urgent symptoms should seek emergency care.

The broader message from CDC’s latest data is simple: measles is still being imported, still finding vulnerable pockets, and still preventable when communities keep vaccination coverage high.

Sources

Editorial note: Weence articles are researched from cited public-health, medical, regulatory, journal, and reputable news sources and may be drafted with AI assistance. They are checked for source support, clarity, and safety guardrails before publication.

This article is for general informational purposes only and is not medical advice. Research findings can be early or incomplete, and health guidance can change. Always talk with a qualified healthcare professional about personal symptoms, diagnosis, medications, vaccines, screenings, or treatment decisions. If you think you may have a medical emergency, call emergency services right away.

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Brian “Weence” Bateman is a health and medical writer who covers public health updates, healthcare policy, and medical developments affecting communities across the United States. He works closely with dentists and healthcare providers and focuses on making complex medical information clear, accurate, and useful for everyday readers.