A variety of cytokines including pro- and anti-inflammatory interleukins (IL) and interferon-γ (IFN-γ) have been detected in surgical specimens from patients with Hashimoto's disease and in rodents with experimental autoimmune thyroiditis induced by immunization with thyroglobulin and Freund's adjuvant [5–9]. Here, IFNG is linked to autoimmune thyroid disease.