TH17 cells are considered as potent inflammation inducers that, in addition to production of IL-17, differentially produce IL-6, IL-2, IL-8, IL-9, TNF-α, IL-17F, IL-21, IL-22, IL-26, IFN-γ, and the chemokine CCL20 and induce activation and recruitment of other cells including neutrophils that are pivotal in inflammation and AD [9, 25]. This evidence concerns the gene IL17A and Alzheimer disease.