Microbiology All of the following are pyrogenic cytokines, except: A Interleukin 18 (IL-18) B Interleukin 6 (IL-6) C Tumor Necrosis Factor (TNF) D Interferon a (IFN a) 💡 Explanation All of the following are pyrogenic cytokines, except: ✓ Correct Answer: A. Interleukin 18 (IL-18)