AGA and autoimmune thyroid disease: In Finland, Collin et al. assessed 83 patients with autoimmune thyroiditis who were tested for EMA IgA and AGA IgA/IgG, and found three asymptomatic celiac patients, and one patient with previously diagnosed celiac disease, i.e. an overall frequency of 4.8%.37 A study in northern Brazil showed that among 457 individuals with antithyroid antibodies, 2.2% were reactive for EMA IgA and 3.1% for TTG.38