CD79A and influenza: To understand the serological response to recurrent IIV vaccination with 3 antigenically different H3N2 vaccine strains, the levels of serological IgA antibodies that bound to the HA from A/Texas/50/2012 (TX/12), A/Switzerland/9715293/ 2013 (Switz/13), and A/Hong Kong/4108/2014 (HK/14) were determined in young and elderly subjects that were vaccinated over these three consecutive influenza seasons (Figure 2C).