U.S. measles cases reach 4,080, highest total in more than 30 years

The United States has recorded 4,080 confirmed measles cases this year, the highest annual total in more than three decades and a sharp escalation from 2025, according to federal data reported by CBS News.

The Centers for Disease Control and Prevention count, current as of Thursday, Oct. 8, has already far surpassed the 2,289 cases reported during all of 2025. That total had itself been the highest annual number in three decades.

The Big Picture

Measles cases have now exceeded 4,000 nationwide in 2026, a level not seen in the United States in more than 30 years. CBS News reported that the number had already passed the full 2025 total by mid-July and topped 4,000 in August.

Most states and Washington, D.C., have reported cases, CBS News said. The Hill, citing CDC data released Friday, reported cases in 47 states and Washington, D.C. It also reported that Pennsylvania accounted for more than one-quarter of infections reported nationally.

The scope of the outbreak marks a substantial change from recent years. Before 2025, the highest recent annual U.S. count was 1,274 cases in 2019, according to CBS News. Most years recorded much lower totals.

What Happened

The CDC reported 4,080 confirmed cases across the country as of Oct. 8, CBS News said. The 2025 total of 2,289 included more than 750 cases connected to a West Texas outbreak, according to CBS News. That outbreak was linked to the deaths of two children.

Two people have died of measles in the United States this year, according to the CDC data cited by CBS News. Pennsylvania health officials announced in August that two people in Lancaster County had died in connection with measles, the state's first measles-linked deaths in 35 years. Both people were unvaccinated, state officials said.

Why It Matters

Measles is among the most contagious infectious diseases. CBS News reported that it can cause severe lung and brain infections and can lead to cognitive problems, deafness or death. Vaccination can prevent the disease.

The overwhelming majority of this year's cases have occurred in people who were not vaccinated, CBS News reported. The outlet also said outbreaks have spread in communities with lower vaccination rates, citing health experts who identify declining vaccination as a major factor behind increases in preventable infectious diseases.

CDC data show that 92.4% of U.S. kindergartners received measles-mumps-rubella vaccinations in the 2025-2026 school year. That was slightly below the 92.5% recorded the prior school year and well below the 95.2% level reported in 2019-2020.

The CDC says that when more than 95% of people in a community are vaccinated, most people are protected through community immunity, also known as herd immunity. Only 10 states reached the 95% kindergarten vaccination threshold in the 2025-2026 school year, according to CBS News.

Background

The United States has held official measles elimination status since 2000. But continuing outbreaks have put that status at risk, CBS News reported.

The current case count reflects both the size and geographic reach of the outbreaks. While Pennsylvania has reported a particularly large share of cases, infections have been documented across nearly the entire country, according to reporting based on CDC data.

What Happens Next

Federal and state health authorities will continue updating case counts as outbreaks are investigated and new infections are confirmed. The trajectory of the outbreak will also focus attention on vaccination coverage, especially in communities where immunization rates remain below the CDC's 95% benchmark for broad community protection.

The national total is likely to remain under close watch in the months ahead, after 2026 surpassed both last year's already elevated figure and the 2019 total that had previously been the largest recent U.S. measles count.