Frequencies of CD4 and CD8 in the blood of patients with psoriasis vulgaris (n = 35) Before treatment (X±SD) After treatment (X±SD) p (sign test) CD4 (cell / µl) 682, 3 ± 266, 2 511, 4 ± 196, 7 <0, 001 14 CD8 (cell / µl) 611, 9 ± 365, 6 419, 7 ± 191, 0 <0, 001 Conclusion: After treatment, the frequencies of both CD4 and CD8 decreased significantly (both p<0.001).