The aim of this study was to investigate the interleukin-2 (IL-2) production in schizophrenic patients with different forms of disease and controls. 70 schizophrenic patients and 20 healthy subjects were studied. Results obtained have shown that the IL-2 production depend on the forms of disease and different forms of progression. The results showed normal IL-2 production in patients with most forms of progression and decreased IL-2 level in the group with least forms of progression of disease.