Volume 19, Number 5—May 2013
Research
Changes in Severity of Influenza A(H1N1)pdm09 Infection from Pandemic to First Postpandemic Season, Germany
Figure 2

Figure 2. . Age distribution of persons with influenza A(H1N1)pdm09 virus infections, winter 2009–10 and winter 2010–11. Black indicates influenza A(H1N1)pdm09 cases found in the study group at University Hospital Heidelberg; gray indicates influenza cases in Germany.
1These authors contributed equally to this article.