Figure 3From: Occurrence of invasive pneumococcal disease and number of excess cases due to influenza A. Each marker (star) represent number of IPD cases during influenza free weeks, in the time frame when influenza was monitored. Hence it shows the data points used in baseline estimation. The solid line represents baseline. B. For each week, the distributions of all IPD data during the period 1993–2004 are presented as box plots. The solid line represents baseline.Back to article page