↑ IgG and IgA to gliadin in recent-onset psychosis. ↑ IgG and IgA to gliadin in patients with multi-episode schizophrenia but lower than in recent onset. IgG to deamidated gliadin and IgA to tissue to tTG not elevated in either group. Fewer than 1% individuals in each of the groups had levels of these antibodies predictive to celiac disease No differences in the distribution of the HLA DQ2 and HLADQ8 among groups. Here, TGM2 is linked to celiac disease.