c. 1918 AD–c. 1920 AD
1918–1920 influenza pandemic
World history · Culture
The influenza pandemic spread worldwide in 1918–1919 in a context of war, crowding, and troop movements. Infection and mortality estimates are historical reconstructions, and the virus’s origin lacks universal consensus; this record avoids turning an estimate into a definitive count.
Precision, calendar, and review
- Start
- year · approximate
- End
- year · approximate
- Calendar and convention
- Historical-era years; the source calendar is not identified. No conversion of days is assumed.
- Year zero
- The scale goes from 1 BCE to 1 CE without year zero. Changing era names changes labels only.
- Documentary review
- Date not recorded
Reading the date: duration of a process.
Sources
- archive.cdc.gov (opens in a new tab)
Source provenance and scope
- Publication date
- Not identified in metadata; document review pending
- Bibliographic date checked
- 2026-09-23
The correspondence between this reference and individual claims has not yet been itemized.
This record is an editorial synthesis. Consult the sources to check claims and their limits. Chronological relationships alone do not establish causation.