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. 2019 Apr;25(4):691–700. doi: 10.3201/eid2504.180779

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Genetic diversity of influenza A viruses (IAVs) circulating in swine in southeast and northwest Mexico. Fifteen genotypes were identified by surveillance in swine herds in Mexico during 2010–2014. Each oval represents 1 of the 8 segments of the virus genome. The surface antigens HA and NA are listed first, followed by the 6 internal gene segments. Shading of each oval corresponds to 1 of 5 major genetic lineages of swine IAV circulating in humans and swine globally. The rightmost columns indicate the number of viruses from each genotype collected from the northwest and southeast regions in Mexico. Ovals shaded with 2 colors represent mixed infections. CswH1, classical swine H1N1; EAswH1, avian-like Eurasian swine H1N1; HA, hemagglutinin; huH3N2, human H3N2; MP, matrix protein; NA, neuraminidase; NP, nucleoprotein; NS, nonstructural; NW, northwest; PA, polymerase acidic; PB, polymerase basic; pH1N1, pandemic H1N1 clade; SE, southeast; SW, southwest.TRswH3N2, triple reassortant swine H3N2.