CDC Measles Cases 2026: 3,471 Reported by 18 September

Published 21 September 2026 | Data updated by CDC 18 September 2026; surveillance through 17 September 2026

The US Centers for Disease Control and Prevention (CDC) has reported 3,471 confirmed measles cases in the United States in 2026, based on data available through 17 September. The update is relevant beyond the US because measles is highly transmissible and importations can seed outbreaks wherever immunity gaps persist.

At a Glance

3,471 confirmed US cases in 2026 through 17 September.
39 outbreaks; 95% of cases were outbreak-associated.
Reported national two-dose MMR coverage among US kindergartners: 92.4% for 2024–25.
This is US surveillance—not an estimate of India’s burden.

What is new?

The CDC page was updated on 18 September 2026. It records 39 outbreaks and says 95% of confirmed cases were linked to an outbreak. These figures are provisional surveillance counts and may be revised as investigations mature.

What it means for doctors and patients

Clinicians should keep measles in the differential diagnosis for fever with rash, particularly after travel or contact with a suspected case. Infection-control precautions and prompt notification should follow the applicable Indian and local public-health protocol. Patients should not self-diagnose or attend crowded waiting rooms without first contacting a healthcare facility if measles is suspected.

For medical students, the practical lesson is epidemiological: very high population immunity is needed to interrupt measles transmission. Coverage averages can hide local pockets of susceptibility.

Verified facts and numbers

3,471
confirmed US cases

39
reported outbreaks

95%
outbreak-associated

92.4%
US kindergarten two-dose coverage, 2024–25

What is known

The counts and percentages above are directly reported on the CDC surveillance page.
Measles is preventable by vaccination; public-health response depends on rapid recognition, isolation and contact management.

Limitations and uncertainties

Surveillance counts can change after verification or reclassification.
The CDC dataset describes the United States and cannot be used to infer India’s current case count.
Individual vaccination decisions depend on age, prior doses, immune status, pregnancy and official national guidance.

India-specific caveat: Follow MoHFW/NCDC and state guidance for reporting, vaccination and outbreak control. This article does not replace a clinician’s assessment or official Indian case definitions.

Official source

CDC — Measles Cases and Outbreaks (page updated 18 September 2026; data through 17 September 2026).

CDC Reports 3,471 Measles Cases in 2026: What the 18 September Update Means