TPO and autoimmune thyroid disease: Hashimoto’s thyroiditis (HT), also known as chronic lymphocytic or autoimmune thyroiditis, is an autoimmune thyroid disease (AITD) characterized by increased thyroid volume, lymphocytic infiltration of thyroid tissue, and the presence of antibodies against thyroid-specific antigens (TPOAb, i.e., antibodies against thyroid peroxidase and TgAb, i.e., antibodies against thyroglobulin) (1, 2).