Fig. 4: Geographic distribution of influenza HA sequences before (left) and after (right) COVID-19 emergence. | Nature Communications

Fig. 4: Geographic distribution of influenza HA sequences before (left) and after (right) COVID-19 emergence.

From: Human seasonal influenza under COVID-19 and the potential consequences of influenza lineage elimination

Fig. 4

From April 2020 to July 2021, A(H3N2) (590 sequences from 32 countries), A(H1N1) (254 sequences from 18 countries), and B/Victoria (834 sequences from 34 countries) were available for analysis. In comparison to the 16-month period before April 2020 (December 2018 to March 2020), there was a reduction in sequences of 97% for A(H3N2), 99% for A(H1N1), 92% for B/Victoria, and 100% for B/Yamagata. Last updated on 24 August 2021; for an interactive visualization of current seasonal influenza circulation, we refer the reader to the Nextstrain67 platform.

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