IL6 and infection: Many protein biomarkers have been identified that can be used to detect blood infections, such as C-reactive protein (CRP) [5], Interleukin 6 (IL-6) [6], Procalcitonin (PCT) [7], Interleukin 10 (IL-10) [8], Interferon-gamma (IFN-γ) [8], and tumor necrosis factor-alpha (TNF-α) [9–11].