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Data Explorer

Research historical outbreak investigations and the full recall archive, with charts, trends, and advanced filters. Looking for what's happening right now instead? See current Health Alerts.

Historical archive totals

All-time counts across every CDC NORS outbreak investigation in Public Health Trace.

66,696
Historical archive sizeEvery CDC NORS investigation on record
2,217,705
Confirmed casesSum of reported illnesses
54
States affected
December 1, 2023
Latest Archive Update
This is a historical archive

CDC NORS is a historical investigation database, typically finalized well after an outbreak occurs, and may lag current events by a year or more. For the latest public health signals, see Health Alerts.

Download matching outbreaks as CSV

CSV exports include up to 5,000 matching rows (applying your current filters), not the full dataset if it's larger.

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Historical statistics and trends

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Outbreaks reported by year (Full history)

A chart of outbreaks grouped by year.

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Source: CDC public dataLast updated

Summary (Full history)

  • 62,834 outbreaks have been reported over its full history.
  • 2022 was 46% higher than the same period last year (2021: 2,018).
  • The highest complete period was 2016 (4,331).
  • 2023 is incomplete and not included in the figures above.
  • Complete data
  • Incomplete

No disease breakdown is available for these filters.

Outbreaks by state

A bar chart of the number of matching outbreaks by state.

Outbreaks by state
StateOutbreaks
Puerto Rico100
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Archived Outbreak Investigations

Showing 1–20 of 274 outbreaks

Data last updated:

Outbreak investigations may be ongoing; case counts, hospitalizations, and deaths are updated by CDC as investigations continue. Read the full medical disclaimer.