In autoimmune diseases and infection, IL-17 is produced by a variety of host cells, including myeloid cells [21], invariant natural killer (iNK) T cells [22], NK cells [23], [24], γδ T cells [25], [26], [27], and Th17 cells, a subset of helper CD4+ T lymphocytes [17], [28]. This evidence concerns the gene IL17A and autoimmune disease.