This cytokine is essential for NK cell development and survival (Kennedy et al, 2000; Mrozek et al, 1996; Puzanov et al, 1996; Ranson et al, 2003), and contributes to their recruitment, expansion, activation, and IFNγ production during infection (Allavena et al, 1997; Elpek et al, 2010; Lucas et al, 2007; Nguyen et al, 2002). Here, IFNG is linked to infection.