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The current worst-case scenario for pandemic influenza planning is based on the catastrophic 1918-1919 pandemic. In this article, we examine the strength of cross-protection between successive waves of the 1918-1919 pandemic, which has remained a long-standing issue of debate.

Cross‐Protection between Successive Waves of the 1918–1919 Influenza Pandemic: Epidemiological Evidence from US Army Camps and from Britain