CD8A and influenza: Viral antigen derived from influenza, recombinant vaccinia, tick-borne encephalitis or human immunodeficiency type I virus infection was taken up into recycling endosomes, loaded onto MHC-I molecules, and presented to CD8+ T cells (Fonteneau et al., 2003a,b; Hoeffel et al., 2007; Di Pucchio et al., 2008; Lui et al., 2009; Mittag et al., 2011; Tel et al., 2012).