XK and influenza: Therefore, to address a possible role of surface glycoproteins (HA and NA) in the observed in vivo lymphocyte activation, we immunized mice i.v with either of two different formulations of commercially available influenza vaccines: subvirion vaccine containing all the viral components (CSL fluvax vaccine; A/Solomon Islands/3/2006 H1N1, A/Brisbane/10/2007 H3N2, B/Florida/4/2006; 18 μg hemagglutinin) or subunit vaccine containing purified HA and NA (A/Brisbane/59/2007 H1N1, A/Brisbane/10/2007 H3N2 and B/Brisbane/60/2008; 18 μg hemagglutinin).