Figure 8.

An estimate of age-specific attack rates hypothetically applicable to all pandemic seasons. The data displayed are for the pandemics of 1918/9, 1957/8, 1968/9. and 2009/10. The data for 1968/9 come from two studies. The data from Davis et al. were fit separately. All other data are fit well by a linear trend that decreased linearly with age.

Reichert et al. BMC Medicine 2012 10:162   doi:10.1186/1741-7015-10-162
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