Historically, influenza pandemics have encircled the globe in two, sometimes three, waves. During the previous century, the 1918 pandemic, the most deadly of them all, began in a mild wave and then returned in a far more deadly one. In fact, the first wave was so mild that its significance as a warning signal was missed. As we are seeing, the world today is much more alert to such warning signals and much better prepared to respond. Influenza pandemics are caused by a virus that is either entirely…
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