Briefly, the induction of IL-17 in response to various antigens plays a pivotal role in initiation and/or development of several allergic inflammatory responses and autoimmune diseases such as multiple sclerosis (11), autoimmune encephalomyelitis (12), rheumatoid arthritis (13), systemic lupus erythematous (14), Behcet’s disease (15), and psoriasis (16). Here, IL17A is linked to rheumatoid arthritis.