PSMD1 and influenza: Therefore, to explore whether the oxidative responses of PMNs to S1, the anti-S1 IgG, or their ICs described above are affected by influenza infection, in our experiments, we infected human PMNs with the A/Hong Kong/8/1968 H3N2 influenza virus and measured ROS production in response to S1, anti-S1 IgG1, and their ICs (15).