1955 AD
Trial and adoption of inactivated polio vaccine
Epidemics & public health · Poliomielitis · Vacunación · Seguridad de vacunas
In 1955, the inactivated polio vaccine developed by Jonas Salk’s team was announced to have shown efficacy in a large field trial. That same year, cases linked to a contaminated lot temporarily halted the US programme, underscoring that production, regulation, and safety surveillance are part of a vaccination campaign.
Precision, calendar, and review
- Start
- year · no uncertainty qualifier in this record
- 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: point event.
Sources
- www.cdc.gov (opens in a new tab)
Source provenance and scope
- Publication date
- Pending verification: the source could not be accessed
- 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.