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. 2022 Feb 24;10:825645. doi: 10.3389/fpubh.2022.825645

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Copyright © 2022 He, Hou, Chen, Yu, Chen, He, Liu, Gong, Huang, Wu, Pan and Gao.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) The positive rate of different influenza subtypes by age group. (B) The age composition ratio of different influenza subtypes from 2009 to 2014.