• Brown, I.H., 2000. The epidemiology and evolution of influenza viruses in pigs. Vet. Microbiol. 74, 29–46.

  • Kothalawala, H., Toussaint, M.J., Gruys, E., 2006. An overview of swine influenza. Vet. Q. 28, 46–53.

  • Kyriakis, C.S., Zhang, M., Wolf, S., Jones, L.P., Shim, B.S., Chocallo, A.H., Hanson, J.M., Jia, M., Liu, D., Tripp, R.A., 2017. Molecular epidemiology of swine influenza A viruses in the Southeastern United States, highlights regional differences in circulating strains. Vet. Microbiol. 211, 174–179.

  • Killian, M.L., 2014. Hemagglutination assay for influenza virus. Methods Mol. Biol. 1161, 3–9.

  • Li, X., Guo, L., Liu, C., Cheng, Y., Kong, M., Yang, L., Zhuang, Z., Liu, J., Zou, M., Dong, X., Su, X., Gu, Q., 2019. Human infection with a novel reassortant Eurasian-avian lineage swine H1N1 virus in northern China. Emerg. Microb. Infect. 8, 1535–1545.

  • Liang, H., Lam, T.T., Fan, X., Chen, X., Zeng, Y., Zhou, J., Duan, L., Tse, M., Chan, C.H., Li, L., Leung, T.Y., Yip, C.H., Cheung, C.L., Zhou, B., Smith, D.K., Poon, L.L., Peiris, M., Guan, Y., Zhu, H., 2014. Expansion of genotypic diversity and establishment of 2009 H1N1 pandemic-origin internal genes in pigs in China. J. Virol. 88, 10864–10874.

  • Parys, A., Vandoorn, E., King, J., Graaf, A., Pohlmann, A., Beer, M., Harder, T., Van Reeth, K., 2021. Human infection with Eurasian avian-like swine influenza A(H1N1) virus, The Netherlands, september 2019. Emerg. Infect. Dis. 27, 939–943.

  • Pensaert, M., Ottis, K., Vandeputte, J., Kaplan, M.M., Bachmann, P.A., 1981. Evidence for the natural transmission of influenza A virus from wild ducts to swine and its potential importance for man. Bull. World Health Organ. 59, 75–78.

  • Peacock, T.P., Swann, O.C., Salvesen, H.A., Staller, E., Leung, P.B., Goldhill, D.H., Zhou, H., Lillico, S.G., Whitelaw, C.B.A., Long, J.S., Barclay, W.S., 2020. Swine ANP32A supports avian influenza virus polymerase. J. Virol. 94.

  • Shope, R.E., 1931. Swine influenza: I. Experimental transmission and pathology. J. Exp. Med. 54, 349–359.

  • Smith, G.J., Vijaykrishna, D., Bahl, J., Lycett, S.J., Worobey, M., Pybus, O.G., Ma, S.K., Cheung, C.L., Raghwani, J., Bhatt, S., Peiris, J.S., Guan, Y., Rambaut, A., 2009. Origins and evolutionary genomics of the 2009 swine-origin H1N1 influenza A epidemic. Nature 459, 1122–1125.

  • Sun, H., Xiao, Y., Liu, J., Wang, D., Li, F., Wang, C., Li, C., Zhu, J., Song, J., Sun, H., Jiang, Z., Liu, L., Zhang, X., Wei, K., Hou, D., Pu, J., Sun, Y., Tong, Q., Bi, Y., Chang, K.C., Liu, S., Gao, G.F., Liu, J., 2020. Prevalent Eurasian avian-like H1N1 swine influenza virus with 2009 pandemic viral genes facilitating human infection. Proc. Natl. Acad. Sci. U. S. A. 117, 17204–17210.

  • Sun, Y.F., Wang, X.H., Li, X.L., Zhang, L., Li, H.H., Lu, C., Yang, C.L., Feng, J., Han, W., Ren, W.K., Tian, X.X., Tong, G.Z., Wen, F., Li, Z.J., Gong, X.Q., Liu, X.M., Ruan, B.Y., Yan, M.H., Yu, H., 2016. Novel triple-reassortant H1N1 swine influenza viruses in pigs in Tianjin, Northern China. Vet. Microbiol. 183, 85–91.

  • Vijaykrishna, D., Poon, L.L., Zhu, H.C., Ma, S.K., Li, O.T., Cheung, C.L., Smith, G.J., Peiris, J.S., Guan, Y., 2010. Reassortment of pandemic H1N1/2009 influenza A virus in swine. Science 328, 1529.

  • Vijaykrishna, D., Smith, G.J., Pybus, O.G., Zhu, H., Bhatt, S., Poon, L.L., Riley, S., Bahl, J., Ma, S.K., Cheung, C.L., Perera, R.A., Chen, H., Shortridge, K.F., Webby, R.J., Webster, R.G., Guan, Y., Peiris, J.S., 2011. Long-term evolution and transmission dynamics of swine influenza A virus. Nature 473, 519–522.

  • Vincent, A., Awada, L., Brown, I., Chen, H., Claes, F., Dauphin, G., Donis, R., Culhane, M., Hamilton, K., Lewis, N., Mumford, E., Nguyen, T., Parchariyanon, S., Pasick, J., Pavade, G., Pereda, A., Peiris, M., Saito, T., Swenson, S., Van Reeth, K., Webby, R., Wong, F., Ciacci-Zanella, J., 2014. Review of influenza A virus in swine worldwide: a call for increased surveillance and research. Zoonoses Public Health 61, 4–17.

  • Wang, D.Y., Qi, S.X., Li, X.Y., Guo, J.F., Tan, M.J., Han, G.Y., Liu, Y.F., Lan, Y., Yang, L., Huang, W.J., Cheng, Y.H., Zhao, X., Bai, T., Wang, Z., Wei, H.J., Xiao, N., Shu, Y.L., 2013. Human infection with Eurasian avian-like influenza A(H1N1) virus, China. Emerg. Infect. Dis. 19, 1709–1711.

  • Zhu, W., Zhang, H., Xiang, X., Zhong, L., Yang, L., Guo, J., Xie, Y., Li, F., Deng, Z., Feng, H., Huang, Y., Hu, S., Xu, X., Zou, X., Li, X., Bai, T., Chen, Y., Li, Z., Li, J., Shu, Y., 2016. Reassortant Eurasian avian-like influenza A(H1N1) virus from a severely ill child, hunan province, China, 2015. Emerg. Infect. Dis. 22, 1930–1936.