The United States has logged 2,030 confirmed measles cases for 2026, according to CDC surveillance data current as of June 4. The agency reports that 93% of confirmed cases (1,890 of 2,030) are outbreak-associated — a signature of sustained local transmission rather than scattered, unconnected importations.
The geographic spread is wide. CDC says 2,020 cases were reported by 40 jurisdictions, with a further 10 cases recorded among international visitors. The agency counts 30 new outbreaks in 2026, defining an outbreak as three or more linked cases.
What the clustering signals
The outbreak share is the number to watch. When most cases trace to defined chains rather than one-off travel infections, it indicates the virus is finding pockets of susceptibility and circulating once it arrives — the pattern that strains containment and pushes case counts higher.
93% of confirmed cases (1,890 of 2,030) are outbreak-associated.
Measles remains among the most transmissible human pathogens. CDC notes that measles was declared eliminated in the United States in 2000, meaning the absence of continuous year-round transmission; a year with thousands of confirmed cases tied largely to sustained outbreak chains runs against that status. The agency’s page also maintains tables for hospitalizations, deaths, age distribution, and vaccination status, but those breakdowns were not legible in the data captured for this report, so no figures for them are printed here.
The surveillance count is provisional and is revised as jurisdictions confirm and report additional cases. This is a public-health surveillance report, not medical advice; readers with questions about immunization should consult a clinician.