The 1918 Spanish Flu: Not Spanish, Killed 50 Million

The Pandemic Misnamed "Spanish Flu"

The 1918 influenza pandemic killed ~50 million worldwide — but it did not originate in Spain.

Origin

• Most Likely: United States (Haskell County, Kansas → Camp Funston, Fort Riley, March 1918).
• Alternative hypotheses: France (Étaples), China — but US evidence strongest.

Why "Spanish Flu"?

• WWI censorship: Warring nations (US, UK, France, Germany) suppressed flu news to maintain morale.
• Spain was neutral — press reported freely on the outbreak (including King Alfonso XIII's illness).
• World assumed it started there — name stuck.

Impact

• Infected: ~500 million (1/3 of global population).
• Deaths: 17–50 million (some estimates 100M) — more than WWI.
• Waves: Spring 1918 (mild) → Fall 1918 (deadly) → Winter 1919.
• Demographics: Unusually high mortality in young adults (20–40) — cytokine storm.

Legacy

• Modern virology, surveillance (WHO GISRS), vaccine platforms.
• Reminder: pandemics ignore borders, names, and politics.

The virus was H1N1 avian-origin. Spain was just the honest messenger.