CD79A and avian influenza: Several other DNA vaccines (such as SARS-CoV-2 spike protein-CpG oligonucleotide vaccine [79], H5N1 avian influenza or H1N1 2009 virus hemagglutinin DNA vaccine [80], or mannosylated chitosan-formulated DNA vaccine [49]) are effective in inducing high levels of IgA antibodies in the lungs of mice after intranasal immunization.