U.S. measles cases have already surpassed the total recorded for 2025, making 2026 one of the worst years for the virus in decades — and the calendar still has months to go. The Centers for Disease Control and Prevention has reported more than 2,000 cases, according to an agency update reported by the Associated Press. Large outbreaks this year have been centered in South Carolina, Utah, and Arizona.
The AP notes South Carolina and Utah have reported large outbreaks — hundreds of cases in each state — and officials say the true totals could be higher. State health departments and researchers are using models and genetic data to better estimate outbreak size. Hospitalization figures also aren’t reported consistently across all states.
Vaccine protection is part of the backdrop. National kindergarten MMR coverage has fallen below the roughly 95% level public-health guidance aims for, and experts tie today’s spread to communities where coverage is lower. International health officials are expected to review measles-free designations later this year, AP reports.
Case counts aren’t the only signal to watch. The CDC runs a measles wastewater dashboard that compiles test results from treatment plants across the country. The dataset brings together samples from state and local health departments, CDC’s national testing contractor, and academic networks. The wastewater data are updated weekly and provide a running history of results from U.S. sampling locations, giving health departments another way to gauge where the virus may be circulating.
None of this is abstract for families. Measles is highly contagious, and outbreaks can build quickly in pockets where shots are delayed or refused. Infants too young to be vaccinated, people with weakened immune systems, and a small share of people who do not develop strong protection from the vaccine are at higher risk of severe illness. With reported case numbers already exceeding the total recorded for 2025, health officials are urging attention to routine immunization and to local alerts about exposures.
Why it matters
For parents and schools, this is about keeping kids in class and out of the hospital. The AP’s reporting shows case counts rising faster than in 2025 and concentrated in places with lower vaccination coverage. The CDC’s wastewater dashboard adds another early-warning tool that local officials can use to spot trouble and respond sooner. Simple steps — checking vaccination records and paying attention to local health notices — can reduce disruptions and protect the most vulnerable.