Additional file 3.

Comparison of ILI incidence according to different definitions of ILI with the HPA's estimated ILI cases [17,21,27,28], without moving averages. As in additional file 1, the denominator used is those participants who completed the symptoms questionnaire on the week in question.

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Tilston et al. BMC Public Health 2010 10:650   doi:10.1186/1471-2458-10-650