An unpublished 1918 study of army camps demonstrates this. The army had data on 120 training camps—99 imposed quarantine and 21 did not. But there was no difference in mortality or morbidity between camps implementing quarantine and those that didn’t; there was not even any difference in how long it took influenza to pass through the camp. The story, however, isn’t quite that simple: the epidemiologist who performed the study looked not just at numbers but at actual practice, and found that out of the 99 camps that imposed quarantine, only a half dozen or so rigidly enforced it. Those few did
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