CD69 and Sepsis: In our previous study [20], we found that the expression of both CD69 and IFN-γ was increased in γδ T cells from patients with sepsis compared with that in cells from healthy controls; however, after antigen stimulation ex vivo, the expression of both CD69 and IFN-γ in γδ T cells was significantly lower in patients with sepsis than that in healthy individuals.