Named pandemics mark antigenic shocks. Ordinary winters are quieter and still fill pediatric and geriatric wards.
GISRS, the WHO influenza surveillance network, turned strain choice into a global routine after mid-century.
Timeline
A severe pandemic shows how a novel package can sweep a world without modern shots.
Smith, Andrewes and Laidlaw isolate influenza A from people in London.
Military programmes begin killed-virus influenza vaccines.
Asian flu replaces H1N1 in humans — a classic reassortant pandemic.
Hong Kong flu introduces H3, still a major seasonal actor after decades of drift.
An H1N1 lineage reappears in people and co-circulates with H3N2.
A triple-reassortant H1N1 spreads globally; seasonal H1N1 is displaced.
Non-pharmaceutical measures briefly suppressed flu, then waves returned with mixed timing.
History here is public-health memory, not a recipe.
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