Past Flu Pandemics Studied For Clues To Future Course Of 2009 H1N1 Virus

A commonly held belief that severe influenza pandemics are preceded by a milder wave of illness arose because some accounts of the flu pandemic of 1918-19 suggested that it may have followed such a pattern. But two scientists say the existing data are insufficient to conclude decisively that the 1918-19 pandemic was presaged by a milder spring wave, or that the responsible virus had increased in lethality between the beginning and end of 1918.

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