No one knows for sure where the 1918 flu came from or how it turned into such a killer strain. All that is known is that it began as an ordinary flu but then it changed. It infected people in the spring of 1918, sickening its victims for about three days with chills and fever, but rarely killing them. Then it disappeared, returning in the fall with the power of a juggernaut. In retrospect, medical experts talk of the two waves of the 1918 flu. The first was banal, and easily forgotten. No one mentioned plagues or germ warfare when the influenza epidemic first arrived. But when it came back, in
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