Government or official record
150th Anniversary of John Snow and the Pump Handle
U.S. Centers for Disease Control and Prevention
Cross-File evidence ledger
Where this source supports the record
Each entry separates the File’s editorial relevance note from its exact, section-level claims. A bibliography link without a direct claim is labeled plainly.
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Epidemics & public health · August–September 1854Open File evidence →
The Broad Street Cholera Investigation
The former Broad Street pump, now Broadwick Street, Soho · United Kingdom
Why editors use it hereCDC account of the outbreak, Snow’s investigation, and its significance to epidemiology.
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Quick read
During a severe cholera outbreak in Soho, physician John Snow mapped deaths and interviewed residents about where they obtained water.
Reviewed 24 July 2026 -
Trigger and conditions
The neighborhood outbreak accelerated at the end of August 1854.
Reviewed 24 July 2026 -
Uncertainty
Simplified retellings often imply that Snow personally removed the handle and immediately stopped the epidemic.
Reviewed 24 July 2026 -
Why it matters
Broad Street illustrates evidence-led intervention under uncertainty.
Reviewed 24 July 2026
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Quick read