1. Adler-Moore, J. P., W. Ernst, H. Kim, N. Ward, S. M. Chiang, T. Do, and G. Fujii. 2017. Monomeric M2e antigen in VesiVax((R)) liposomes stimulates protection against type a strains of influenza comparable to liposomes with multimeric forms of M2e. J Liposome Res 27:210-220.
2. Brandtzaeg, P. 1974. Presence of J chain in human immunocytes containing various immunoglobulin classes. Nature 252:418-420.A. Calder, L. J., S. Wasilewski, J. A. Berriman, and P. B. Rosenthal. 2010. Structural organization of a filamentous influenza A virus. Pro Natl Acad Sci U S A.107:10685-10690.
3. Cate, T. R., Y. Rayford, D. Nino, P. Winokur, R. Brady, R. Belshe, W. Chen, R. L. Atmar, and R. B. Couch. 2010. A high dosage influenza vaccine induced significantly more neuraminidase antibody than standard vaccine among elderly subjects. Vaccine 28:2076-2079.
4. Caton, A. J., G. G. Brownlee, J. W. Yewdell, and W. Gerhard. 1982. The antigenic structure of the influenza virus A/PR/8/34 hemagglutinin (H1 subtype). Cell 31:417-427.
5. Chen, B. J., G. P. Leser, D. Jackson, and R. A. Lamb. 2008. The influenza virus M2 protein cytoplasmic tail interacts with the M1 protein and influences virus assembly at the site of virus budding. J Virol. 82:10059-10070.
6. Chen, Y. Q., L. Y. Lan, M. Huang, C. Henry, and P. C. Wilson. 2019. Hemagglutinin Stalk-Reactive Antibodies Interfere with Influenza Virus Neuraminidase Activity by Steric Hindrance. J Virol. 93.
7. Chizhmakov, I. V., F. M. Geraghty, D. C. Ogden, A. Hayhurst, M. Antoniou, and A. J. Hay. 1996. Selective proton permeability and pH regulation of the influenza virus M2 channel expressed in mouse erythroleukaemia cells. The J Physiol. 494 ( Pt 2):329-336.
8. Cohen, M., X. Q. Zhang, H. P. Senaati, H. W. Chen, N. M. Varki, R. T. Schooley, and P. Gagneux. 2013. Influenza A penetrates host mucus by cleaving sialic acids with neuraminidase. Virol J. 10:321.
9. Corthesy, B., Y. Benureau, C. Perrier, C. Fourgeux, N. Parez, H. Greenberg, and I. Schwartz-Cornil. 2006. Rotavirus anti-VP6 secretory immunoglobulin A contributes to protection via intracellular neutralization but not via immune exclusion. J Virol. 80:10692-10699.
10. Corti, D., J. Voss, S. J. Gamblin, G. Codoni, A. Macagno, D. Jarrossay, S. G. Vachieri, D. Pinna, A. Minola, F. Vanzetta, C. Silacci, B. M. Fernandez-Rodriguez, G. Agatic, S. Bianchi, I. Giacchetto-Sasselli, L. Calder, F. Sallusto, P. Collins, L. F. Haire, N. Temperton, J. P. Langedijk, J. J. Skehel, and A. Lanzavecchia. 2011. A neutralizing antibody selected from plasma cells that binds to group 1 and group 2 influenza A hemagglutinins. Science 333:850-856.
11. Dabaghian, M., A. M. Latifi, M. Tebianian, H. NajmiNejad, and S. M. Ebrahimi. 2018. Nasal vaccination with r4M2e.HSP70c antigen encapsulated into N-trimethyl chitosan (TMC) nanoparticulate systems: Preparation and immunogenicity in a mouse model. Vaccine 36:2886-2895.
12. Edinger, T. O., M. O. Pohl, and S. Stertz. 2014. Entry of influenza A virus: host factors and antiviral targets. J Gen Virol. 95:263-277.
13. Ekiert, D. C., G. Bhabha, M. A. Elsliger, R. H. Friesen, M. Jongeneelen, M. Throsby, J. Goudsmit, and I. A. Wilson. 2009. Antibody recognition of a highly conserved influenza virus epitope. Science 324:246-251.
14. Fan, J., X. Liang, M. S. Horton, H. C. Perry, M. P. Citron, G. J. Heidecker, T. M. Fu, J. Joyce, C. T. Przysiecki, P. M. Keller, V. M. Garsky, R. Ionescu, Y. Rippeon, L. Shi, M. A. Chastain, J. H. Condra, M. E. Davies, J. Liao, E. A. Emini, and J. W. Shiver. 2004. Preclinical study of influenza virus A M2 peptide conjugate vaccines in mice, ferrets, and rhesus monkeys. Vaccine 22:2993-3003.
15. Fleury, D., B. Barrere, T. Bizebard, R. S. Daniels, J. J. Skehel, and M. Knossow. 1999. A complex of influenza hemagglutinin with a neutralizing antibody that binds outside the virus receptor binding site. Nat Struct Biol. 6:530- 534.
16. Gordon, N. A., K. L. McGuire, S. K. Wallentine, G. A. Mohl, J. D. Lynch, R. G. Harrison, and D. D. Busath. 2017. Divalent copper complexes as influenza A M2 inhibitors. Antiviral Res. 147:100-106.
17. Gould, V. M. W., J. N. Francis, K. J. Anderson, B. Georges, A. V. Cope, and J. S. Tregoning. 2017. Nasal IgA Provides Protection against Human Influenza Challenge in Volunteers with Low Serum Influenza Antibody Titre. Front Microbiol. 8:900.
18. Hai, R., F. Krammer, G. S. Tan, N. Pica, D. Eggink, J. Maamary, I. Margine, R. A. Albrecht, and P. Palese. 2012. Influenza viruses expressing chimeric hemagglutinins: globular head and stalk domains derived from different subtypes. J Virol. 86:5774-5781.
19. Holsinger, L. J., M. A. Shaughnessy, A. Micko, L. H. Pinto, and R. A. Lamb. 1995. Analysis of the posttranslational modifications of the influenza virus M2 protein. J Virol. 69:1219-1225.
20. Isakova-Sivak, I., V. Matyushenko, T. Kotomina, I. Kiseleva, E. Krutikova, S. Donina, A. Rekstin, N. Larionova, D. Mezhenskaya, K. Sivak, A. Muzhikyan, A. Katelnikova, and L. Rudenko. 2019. Sequential Immunization with Universal Live Attenuated Influenza Vaccine Candidates Protects Ferrets against a High-Dose Heterologous Virus Challenge. Vaccines 7:61.
21. Ito, R., Y. A. Ozaki, T. Yoshikawa, H. Hasegawa, Y. Sato, Y. Suzuki, R. Inoue, T. Morishima, N. Kondo, T. Sata, T. Kurata, and S. Tamura. 2003. Roles of anti-hemagglutinin IgA and IgG antibodies in different sites of the respiratory tract of vaccinated mice in preventing lethal influenza pneumonia. Vaccine 21:2362- 2371.
22. Ito, T., O. T. Gorman, Y. Kawaoka, W. J. Bean, and R. G. Webster. 1991. Evolutionary analysis of the influenza A virus M gene with comparison of the M1 and M2 proteins. J Virol. 65:5491-5498.
23. Jegaskanda, S., E. R. Job, M. Kramski, K. Laurie, G. Isitman, R. de Rose, W. R. Winnall, I. Stratov, A. G. Brooks, P. C. Reading, and S. J. Kent. 2013. Cross-reactive influenza-specific antibody-dependent cellular cytotoxicity antibodies in the absence of neutralizing antibodies. J Immunol. 190:1837-1848.
24. Job, E. R., M. Schotsaert, L. I. Ibanez, A. Smet, T. Ysenbaert, K. Roose, M. Dai, C. A. M. de Haan, H. Kleanthous, T. U. Vogel, and X. Saelens. 2018. Antibodies Directed toward Neuraminidase N1 Control Disease in a Mouse Model of Influenza. J Virol. 92: e01584-17.
25. Johansen, F. E., R. Braathen, and P. Brandtzaeg. 2000. Role of J chain in secretory immunoglobulin formation. Scand J Immunol. 52:240-248.
26. Kida, H., L. E. Brown, and R. G. Webster. 1982. Biological activity of monoclonal antibodies to operationally defined antigenic regions on the hemagglutinin molecule of A/Seal/Massachusetts/1/80 (H7N7) influenza virus. Virology 122:38-47.
27. Kim, C. U., W. Lew, M. A. Williams, H. Liu, L. Zhang, S. Swaminathan, N. Bischofberger, M. S. Chen, D. B. Mendel, C. Y. Tai, W. G. Laver, and R. C. Stevens. 1997. Influenza neuraminidase inhibitors possessing a novel hydrophobic interaction in the enzyme active site: design, synthesis, and structural analysis of carbocyclic sialic acid analogues with potent anti-influenza activity. J Am Chem Soc. 119:681-690.
28. Klenk, H. D., R. Rott, M. Orlich, and J. Blodorn. 1975. Activation of influenza A viruses by trypsin treatment. Virology 68:426-439.
29. Kok, T. W., M. Costabile, G. A. Tannock, and P. Li. 2018. Colocalization of intracellular specific IgA (icIgA) with influenza virus in patients' nasopharyngeal aspirate cells. J Virol Methods. 252:8-14.
30. Kolpe, A., B. Schepens, W. Fiers, and X. Saelens. 2017. M2-based influenza vaccines: recent advances and clinical potential. Expert Rev Vaccines. 16:123- 136.
31. Krammer, F., and P. Palese. 2013. Influenza virus hemagglutinin stalk-based antibodies and vaccines. Curr Opin Virol. 3:521-530.
32. Lambre, C. R., H. Terzidis, A. Greffard, and R. G. Webster. 1991. An enzyme- linked lectin assay for sialidase. Clin Chim Acta. 198:183-193.
33. Leser, G. P., and R. A. Lamb. 2017. Lateral Organization of Influenza Virus Proteins in the Budozone Region of the Plasma Membrane. J Virol. 91:e02104- 16.
34. Manzoor, R., Eguchi, N., Yoshida, R., Ozaki, H., Kondoh, T., Okuya, K., Miyamoto, H., and Takada, A. 2020. A Novel Mechanism Underlying Antiviral Activity of an Influenza Virus M2-Specific Antibody. J Virol. 95: e01277-20.
35. Matrosovich, M., T. Matrosovich, W. Garten, and H. D. Klenk. 2006. New low-viscosity overlay medium for viral plaque assays. Virol J. 3:63.
36. Mazanec, M. B., C. L. Coudret, and D. R. Fletcher. 1995. Intracellular neutralization of influenza virus by immunoglobulin A anti-hemagglutinin monoclonal antibodies. J Virol. 69:1339-1343.
37. Mazanec, M. B., C. S. Kaetzel, M. E. Lamm, D. Fletcher, and J. G. Nedrud. 1992. Intracellular neutralization of virus by immunoglobulin A antibodies. Pro Natl Acad Sci U S A. 89:6901-6905.
38. McCown, M. F., and A. Pekosz. 2005. The influenza A virus M2 cytoplasmic tail is required for infectious virus production and efficient genome packaging. J Virol. 79:3595-3605.
39. Medina, R. A., and A. Garcia-Sastre. 2011. Influenza A viruses: new research developments. Nat Rev Microbiol. 9:590-603.
40. Muramatsu, M., R. Yoshida, H. Miyamoto, D. Tomabechi, M. Kajihara, J. Maruyama, T. Kimura, R. Manzoor, K. Ito, and A. Takada. 2013. Heterosubtypic antiviral activity of hemagglutinin-specific antibodies induced by intranasal immunization with inactivated influenza viruses in mice. PLoS One. 8:e71534.
41. Muramatsu, M., R. Yoshida, A. Yokoyama, H. Miyamoto, M. Kajihara, J. Maruyama, N. Nao, R. Manzoor, and A. Takada. 2014. Comparison of antiviral activity between IgA and IgG specific to influenza virus hemagglutinin: increased potential of IgA for heterosubtypic immunity. PLoS One. 9:e85582.
42. Murphy, B. R., and M. L. Clements. 1989. The systemic and mucosal immune response of humans to influenza A virus. Curr Top Microbiol Immunol. 146:107- 116.
43. Muto, N. A., R. Yoshida, T. Suzuki, S. Kobayashi, H. Ozaki, D. Fujikura, R. Manzoor, M. Muramatsu, A. Takada, T. Kimura, and H. Sawa. 2012. Inhibitory effects of an M2-specific monoclonal antibody on different strains of influenza A virus. Jpn J Vet Res. 60:71-83.
44. Nao, N., M. Kajihara, R. Manzoor, J. Maruyama, R. Yoshida, M. Muramatsu, H. Miyamoto, M. Igarashi, N. Eguchi, M. Sato, T. Kondoh, M. Okamatsu, Y. Sakoda, H. Kida, and A. Takada. 2015. A Single Amino Acid in the M1 Protein Responsible for the Different Pathogenic Potentials of H5N1 Highly Pathogenic Avian Influenza Virus Strains. PLoS One. 10:e0137989.
45. Nayak, D. P., E. K. Hui, and S. Barman. 2004. Assembly and budding of influenza virus. Virus Res. 106:147-165.
46. Neumann, G., T. Watanabe, H. Ito, S. Watanabe, H. Goto, P. Gao, M. Hughes, D. R. Perez, R. Donis, E. Hoffmann, G. Hobom, and Y. Kawaoka. 1999. Generation of influenza A viruses entirely from cloned cDNAs. Pro Natl Acad Sci U S A. 96:9345-9350.
47. Niwa, H., K. Yamamura, and J. Miyazaki. 1991. Efficient selection for high- expression transfectants with a novel eukaryotic vector. Gene 108:193-199.
48. Noda, T., H. Sagara, E. Suzuki, A. Takada, H. Kida, and Y. Kawaoka. 2002. Ebola virus VP40 drives the formation of virus-like filamentous particles along with GP. J Virol. 76:4855-4865.
49. Norderhaug, I. N., F. E. Johansen, H. Schjerven, and P. Brandtzaeg. 1999. Regulation of the formation and external transport of secretory immunoglobulins. Crit Rev Immunol. 19:481-508.
50. Ohuchi, M., N. Asaoka, T. Sakai, and R. Ohuchi. 2006. Roles of neuraminidase in the initial stage of influenza virus infection. Microbes Infect. 8:1287-1293.
51. Okada, J., N. Ohshima, R. Kubota-Koketsu, Y. Iba, S. Ota, W. Takase, T. Yoshikawa, T. Ishikawa, Y. Asano, Y. Okuno, and Y. Kurosawa. 2011. Localization of epitopes recognized by monoclonal antibodies that neutralized the H3N2 influenza viruses in man. J Gen Virol. 92:326-335.
52. Okuno, Y., K. Matsumoto, Y. Isegawa, and S. Ueda. 1994. Protection against the mouse-adapted A/FM/1/47 strain of influenza A virus in mice by a monoclonal antibody with cross-neutralizing activity among H1 and H2 strains. J Virol. 68:517-520.
53. Palese, P., K. Tobita, M. Ueda, and R. W. Compans. 1974. Characterization of temperature sensitive influenza virus mutants defective in neuraminidase. Virology 61:397-410.
54. Pinto, L. H., L. J. Holsinger, and R. A. Lamb. 1992. Influenza virus M2 protein has ion channel activity. Cell 69:517-528.
55. Rossman, J. S., X. Jing, G. P. Leser, and R. A. Lamb. 2010. Influenza virus M2 protein mediates ESCRT-independent membrane scission. Cell 142:902-913.
56. Saelens, X. 2019. The Role of Matrix Protein 2 Ectodomain in the Development of Universal Influenza Vaccines. J Infect Dis. 219:S68-S74.
57. Saito, S., K. Sano, T. Suzuki, A. Ainai, Y. Taga, T. Ueno, K. Tabata, K. Saito, Y. Wada, Y. Ohara, H. Takeyama, T. Odagiri, T. Kageyama, K. Ogawa-Goto, P. Multihartina, V. Setiawaty, K. N. A. Pangesti, and H. Hasegawa. 2019. IgA tetramerization improves target breadth but not peak potency of functionality of anti-influenza virus broadly neutralizing antibody. PLoS Pathog. 15:e1007427.
58. Schneemann, A., J. A. Speir, G. S. Tan, R. Khayat, D. C. Ekiert, Y. Matsuoka, and I. A. Wilson. 2012. A virus-like particle that elicits cross-reactive antibodies to the conserved stem of influenza virus hemagglutinin. J Virol. 86:11686-11697.
59. Schroeder, C., H. Heider, E. Moncke-Buchner, and T. I. Lin. 2005. The influenza virus ion channel and maturation cofactor M2 is a cholesterol-binding protein. Eur Biophys J. 34:52-66.
60. Skehel, J. J., and D. C. Wiley. 2000. Receptor binding and membrane fusion in virus entry: the influenza hemagglutinin. Annu Rev Biochem. 69:531-569.
61. Steel, J., A. C. Lowen, T. T. Wang, M. Yondola, Q. Gao, K. Haye, A. Garcia- Sastre, and P. Palese. 2010. Influenza virus vaccine based on the conserved hemagglutinin stalk domain. mBio 1: e00018-10.
62. Steinhauer, D. A. 1999. Role of hemagglutinin cleavage for the pathogenicity of influenza virus. Virology 258:1-20.
63. Suzuki, T., A. Ainai, and H. Hasegawa. 2017. Functional and structural characteristics of secretory IgA antibodies elicited by mucosal vaccines against influenza virus. Vaccine 35:5297-5302.
64. Suzuki, T., A. Kawaguchi, A. Ainai, S. Tamura, R. Ito, P. Multihartina, V. Setiawaty, K. N. Pangesti, T. Odagiri, M. Tashiro, and H. Hasegawa. 2015. Relationship of the quaternary structure of human secretory IgA to neutralization of influenza virus. Pro Natl Acad Sci U S A. 112:7809-7814.
65. Takada, A., N. Kuboki, K. Okazaki, A. Ninomiya, H. Tanaka, H. Ozaki, S. Itamura, H. Nishimura, M. Enami, M. Tashiro, K. F. Shortridge, and H. Kida. 1999. Avirulent Avian influenza virus as a vaccine strain against a potential human pandemic. J Virol. 73:8303-8307.
66. Takada, A., S. Matsushita, A. Ninomiya, Y. Kawaoka, and H. Kida. 2003. Intranasal immunization with formalin-inactivated virus vaccine induces a broad spectrum of heterosubtypic immunity against influenza A virus infection in mice. Vaccine 21:3212-3218.
67. Terajima, M., J. Cruz, M. D. Co, J. H. Lee, K. Kaur, J. Wrammert, P. C. Wilson, and F. A. Ennis. 2011. Complement-dependent lysis of influenza a virus- infected cells by broadly cross-reactive human monoclonal antibodies. J Virol. 85:13463-13467.
68. Terauchi, Y., K. Sano, A. Ainai, S. Saito, Y. Taga, K. Ogawa-Goto, S. I. Tamura, T. Odagiri, M. Tashiro, M. Fujieda, T. Suzuki, and H. Hasegawa. 2018. IgA polymerization contributes to efficient virus neutralization on human upper respiratory mucosa after intranasal inactivated influenza vaccine administration. Hum Vaccin Immunother. 14:1351-1361.
69. Thaa, B., A. Herrmann, and M. Veit. 2010. Intrinsic cytoskeleton-dependent clustering of influenza virus M2 protein with hemagglutinin assessed by FLIM- FRET. J Virol. 84:12445-12449.
70. Tiller, T., E. Meffre, S. Yurasov, M. Tsuiji, M. C. Nussenzweig, and H. Wardemann. 2008. Efficient generation of monoclonal antibodies from single human B cells by single cell RT-PCR and expression vector cloning. J Immunol Methods. 329:112-124.
71. Tong, S., Y. Li, P. Rivailler, C. Conrardy, D. A. Castillo, L. M. Chen, S. Recuenco, J. A. Ellison, C. T. Davis, I. A. York, A. S. Turmelle, D. Moran, S. Rogers, M. Shi, Y. Tao, M. R. Weil, K. Tang, L. A. Rowe, S. Sammons, X. Xu, M. Frace, K. A. Lindblade, N. J. Cox, L. J. Anderson, C. E. Rupprecht, and R. O. Donis. 2012. A distinct lineage of influenza A virus from bats. Pro Natl Acad Sci U S A. 109:4269-4274.
72. Tsuchiya, E., K. Sugawara, S. Hongo, Y. Matsuzaki, Y. Muraki, Z. N. Li, and K. Nakamura. 2001. Antigenic structure of the haemagglutinin of human influenza A/H2N2 virus. J Gen Virol. 82:2475-2484.
73. Tudor, D., H. Yu, J. Maupetit, A. S. Drillet, T. Bouceba, I. Schwartz-Cornil, L. Lopalco, P. Tuffery, and M. Bomsel. 2012. Isotype modulates epitope specificity, affinity, and antiviral activities of anti-HIV-1 human broadly neutralizing 2F5 antibody. Pro Natl Acad Sci U S A. 109:12680-12685.
74. Tumpey, T. M., M. Renshaw, J. D. Clements, and J. M. Katz. 2001. Mucosal delivery of inactivated influenza vaccine induces B-cell-dependent heterosubtypic cross-protection against lethal influenza A H5N1 virus infection. J Virol. 75:5141- 5150.
75. Turner, P. J., A. F. Abdulla, M. E. Cole, R. R. Javan, V. Gould, M. E. O'Driscoll, J. Southern, M. Zambon, E. Miller, N. J. Andrews, K. Hoschler, and J. S. Tregoning. 2020. Differences in nasal immunoglobulin A responses to influenza vaccine strains after live attenuated influenza vaccine (LAIV) immunization in children. Clin Exp Immunol. 199:109-118.
76. Varghese, J. N., J. L. McKimm-Breschkin, J. B. Caldwell, A. A. Kortt, and P. M. Colman. 1992. The structure of the complex between influenza virus neuraminidase and sialic acid, the viral receptor. Proteins 14:327-332.
77. von Itzstein, M., W. Y. Wu, G. B. Kok, M. S. Pegg, J. C. Dyason, B. Jin, T. Van Phan, M. L. Smythe, H. F. White, S. W. Oliver, and et al. 1993. Rational design of potent sialidase-based inhibitors of influenza virus replication. Nature 363:418-423.
78. Westgeest, K. B., T. M. Bestebroer, M. I. Spronken, J. Gao, L. Couzens, A. D. Osterhaus, M. Eichelberger, R. A. Fouchier, and M. de Graaf. 2015. Optimization of an enzyme-linked lectin assay suitable for rapid antigenic characterization of the neuraminidase of human influenza A(H3N2) viruses. J Virol Methods. 217:55-63.
79. Wu, Y., Y. Wu, B. Tefsen, Y. Shi, and G. F. Gao. 2014. Bat-derived influenza- like viruses H17N10 and H18N11. Trends Microbiol. 22:183-191.
80. Yamayoshi, S., R. Uraki, M. Ito, M. Kiso, S. Nakatsu, A. Yasuhara, K. Oishi, T. Sasaki, K. Ikuta, and Y. Kawaoka. 2017. A Broadly Reactive Human Anti- hemagglutinin Stem Monoclonal Antibody That Inhibits Influenza A Virus Particle Release. EBioMedicine. 17:182-191.
81. Yoshida, R., M. Igarashi, H. Ozaki, N. Kishida, D. Tomabechi, H. Kida, K. Ito, and A. Takada. 2009. Cross-protective potential of a novel monoclonal antibody directed against antigenic site B of the hemagglutinin of influenza A viruses. PLoS Pathog. 5:e1000350.
82. Zebedee, S. L., and R. A. Lamb. 1988. Influenza A virus M2 protein: monoclonal antibody restriction of virus growth and detection of M2 in virions. J Virol. 62:2762-2772.
83. Zhou, D., Y. Zhang, Q. Li, Y. Chen, B. He, J. Yang, H. Tu, L. Lei, and H. Yan. 2011. Matrix protein-specific IgA antibody inhibits measles virus replication by intracellular neutralization. J Virol. 85:11090-11097.