IL15 and Sepsis: The MAIT cell‐activating cytokines IL‐12, IL‐15 and IL‐18, as well as TNF, IFNγ and IL‐17A, cytokines known to be produced by MAIT cells, were elevated in the plasma of sepsis patients as well as non‐sepsis patients, compared with non‐infected controls (Figure 4a and b).