Memory CD4+ T cells protect against influenza through multiple synergizing mechanisms. - McKinstry KK; Strutt TM; Kuang Y; Brown DM; Sell S; Dutton RW; Swain SL; McKinstry, K Kai; Strutt, Tara M; Kuang, Yi; Brown, Deborah M; Sell, Stewert; et al. (Journal of Clinical Investigation, 2012)