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. 2020 Apr 28;11:735. doi: 10.3389/fmicb.2020.00735

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Copyright © 2020 Ma, Liu, Yin, Qin, Zhou, Yang, Li, Poon and Zhang.

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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Comparative phylogenetic analysis, population dynamics and positive rate of A/H1N1pdm (A), A/H3N2 (B), influenza B/Victoria (C), and influenza B/Yamagata (D) viruses. Phylogenies were inferred using the strict clock model and relative genetic diversity estimated using the Gaussian Markov Random Field (GMRF) model. The branches were colored by sampling year. Solid black lines in the GMRF plot represent mean relative genetic diversity, and the gray shades indicate the 95% HPD (highest probability density) intervals. The positive rate of A/H1N1pdm virus (2009–2019), A/H3N2 (2009–2019), influenza B/Victoria (2015–2019), influenza B/Yamagata (2015–2019) by week of specimen collection in China was retrieved from Chinese National Influenza Center.