“…Previous studies have shown that NP-and M1-based immunization protect mice against lethal challenge with influenza virus (Boyd et al, 2012;Donnelly et al, 1997;Zheng et al, 2013). However, most reported NP-and M1-based vaccines are DNA- (Antrobus et al, 2014;Donnelly et al, 1997;Ohba et al, 2007;Zhirnov et al, 2007) or viral-skeleton-based (Antrobus et al, 2012;Choi et al, 2012;Lillie et al, 2012;Price et al, 2010;Quan et al, 2012), and other papers indicated that NP-based vaccines fail to provide complete protection against influenza virus (Chen et al, 1998;Jamali et al, 2010;Krammer and Palese, 2014;Lawson et al, 1994).…”