Pandemic Influenza H1N1: Reconciling Serosurvey Data With Estimates of the Reproduction Number

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Background:During the 2009 pandemic of influenza A (H1N1), many studies reported estimates of the reproduction number from outbreak data. Since then, seroprevalence studies have been conducted in a number of countries to assess the proportion of the population that was infected in the first wave of the pandemic.Methods:Here, we collate the reproduction number estimates, and use mathematical models to reconcile these with serosurvey data.Results:Most estimates of the reproduction number from outbreaks are in the range of 1.0–2.0, whereas mean estimates calculated from seroprevalence data range from 1.14 to 1.36. Age-specific analysis of these data suggests that the reproduction number for children was approximately 1.6, whereas the reproduction numbers for adults >25 years of age was less than 1.0.Conclusion:The difference between age-groups may help to explain high estimates of the reproduction number from outbreaks involving a large proportion of child cases.

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