Flu pandemics typically come in waves. The 1889–1890 and 1918–1919 flu pandemics each came in three or four waves of increasing lethality. But within a wave, mortality was greater at the beginning of the wave.
http://en.wikipedia.org/wiki/Influenza_pandemic
monkey and piggy grabs bio-banana at 1.56/1.58, page-15
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