NOX4 and influenza: Previous studies have indicated that flavonoids can inhibit influenza and attenuate H1N1-induced acute lung injury (Bang et al., 2018; Ling et al., 2020; Yu et al., 2020), probably via inhibiting TLR signaling (Ling et al., 2020), suppressing NOX4/NF-κB/MLCK pathway (Yu et al., 2020), and inhibiting influenza H1N1 virus neuraminidase (Bang et al., 2018).