The results of a comparative analysis of the percentages of CD3+CD4+ T lymphocytes with intracellular expression of the cytokines IFN-γ, IL-2, IL-4, IL-10 and IL-17 in the patients with type 1 diabetes with anti-VCA antibodies in the IgM class and in the patients without detected anti-VCA antibodies in the IgM, IgG and anti-EBNA-1 in the IgG class are presented in Table 7. This evidence concerns the gene IL17A and type 1 diabetes mellitus.