Treatment with CD137+ Vγ9Vδ2-T cells showed more efficacy in controlling influenza disease than CD137- and whole Vγ9Vδ2-T cells, with the CD137+ Vγ9Vδ2-T cells producing the lowest weight loss (Fig. 3b), highest survival rate (Fig. 3c) and attenuated lung inflammation (Fig. 3d). Here, TNFRSF9 is linked to influenza.