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. 2022 Dec 28;17(1):e13091. doi: 10.1111/irv.13091

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© 2022 The Authors. Influenza and Other Respiratory Viruses published by John Wiley & Sons Ltd.

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Evolution of the population susceptibility to influenza A (H1N1 and H3N2) since 2017 by age group in Australia, Germany, Spain, France, Italy and the United Kingdom. Horizontal red lines show the maximum level of susceptibility before January 2020. The percentage of increase (or decrease) displayed on the plots are computed for the highest susceptibility level ahead of the 2022 (Australia) and 2022–2023 (Europe) influenza season compared with the red lines. Transparent areas stand for susceptible who vaccinated.