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. 2021 Apr 15;12:662028. doi: 10.3389/fmicb.2021.662028

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Copyright © 2021 Danilenko, Komissarov, Fadeev, Bakaev, Ivanova, Petrova, Vassilieva, Komissarova, Zheltukhina, Konovalova and Vasin.

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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Individual serum titers from swine tested for the most abundant influenza A viruses. Color coding reflects different years. The shaded area marks titers with values of 40 or less. (A) individual titers to A/California/07/2009; (B) individual titers to A/swine/England/195852/1992 (H1avN2); (C) individual titers to A/swine/Leningrad region/03/2017 (H1N2); (D) overall number of sera tested within each year and the overall number of sera which tested positive for the influenza A(H1) subtype.