Xia et al. (2016) [35], in their analysis of 320 culture-positive sepsis episodes among 2819 febrile episodes, found no significant differences in median IL-2 levels across diagnostic groups: bacteremic (3.3 pg/mL), clinically diagnosed sepsis (3.2 pg/mL), and non-sepsis infections (3.1 pg/mL; all p > 0.05). Here, IL2 is linked to infection.