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. 2011 Jul 18;6(7):e19932. doi: 10.1371/journal.pone.0019932

Figure 4. Case-series method.

Figure 4

Frequency of total number of cases with known age and onset of illness (grey, left y-axis), of vaccinated cases by week of vaccination (dashed grey line; right y-axis), vaccinated cases by week of illness onset (unprotected period; dashed-dotted line; right y-axis), vaccinated cases by week of illness onset (protected period; black line; right y-axis) and vaccinated cases by week of illness onset that would be expected if the vaccine had no effect (protected period; dashed black line; right y-axis), Germany; week 44–53, 2009.