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CDC reports 3,887 confirmed U.S. measles cases through October 1

CDC lists 3,887 confirmed measles cases in 2026 through October 1, up from 3,659 through September 24. CDC counts 42 outbreaks, and 95 percent of confirmed cases (3,700 of 3,887) are outbreak-associated. Confirmed cases reflect cases reported to CDC by jurisdictions; recent infections may not yet be included because confirmation and reporting take time. The national total should not be read as uniform transmission throughout the country.

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Location
United States
National representative point
First seen
January 1, 2026
Last verified
October 4, 2026
Event date
Cases through October 1, 2026
Authority updated
October 2, 2026
TiPH detected
October 3, 2026
TiPH published
September 22, 2026
Desk publication, not the event date

Markers use representative points at the country or regional level, not exact incident locations. Placement indicates the affected area, not a precise site.

What changed since the prior scan

Material update in the October 3 edition. The count moved from 3,659 confirmed cases through September 24 to 3,887 through October 1, outbreaks from 40 to 42, and outbreak-associated cases from 3,478 to 3,700. Earlier editions are preserved and not rewritten.

History

  1. First seen (source)

    First reported by the primary source. External event date, not a TiPH publication date.

  2. Added to the desk

    Added to the Global Signal Desk in the September 22 scan.

  3. Updated

    Material update from CDC: 3,659 confirmed cases through September 24, up from 3,471 through September 17. Forty outbreaks; 95 percent of cases (3,478 of 3,659) are outbreak-associated.

  4. Updated

    Material update from CDC: 3,887 confirmed cases through October 1, up from 3,659 through September 24; 42 outbreaks and 3,700 outbreak-associated cases (95 percent). Published with the October 3 scan edition.

Primary sources

Who works on this?

Events like this are answered by teams across public health. These are real profession types that respond to this kind of event — not people assigned to it.

  • Epidemiologist

    Tracks how and where disease spreads and estimates risk to populations.

  • Immunization program manager

    Plans and runs vaccination campaigns and monitors coverage.

  • Public health nurse

    Delivers frontline prevention, screening, and community care.

  • Vaccine cold-chain logistician

    Keeps vaccines viable from manufacture to the point of care.

  • Health communication specialist

    Turns technical findings into clear, trustworthy public guidance.

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Corrections & updates

This record is reverified against its primary sources on a twice-daily scan. When the evidence changes, the record changes and the change is logged in the review record — including signals we remove. This is situational awareness, not clinical or travel advice.

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