Altogether 97 patients with atopic dermatitis have been examined to follow this relationship, 72 patients presented with disseminated efflorescence, 25 patients with local rash. Measurements of immunoglobulins A, M, G, and D, of the C3c complement components, of the total and allergen-specific IgE C4, inactivators have been carried out, as well as of the total lymphocyte, B lymphocyte, and CD3+, CD4+, and CD8+ lymphocyte subpopulations; the lymphocyte response to ConA mitogenic stimulation has been also under study. The patients with normal and elevated levels of IgE differed by the clinical picture of the disease and by case histories, as well as by the immunity parameters and by the results of zaditen therapy. Cases with very low IgE levels may be indicative of alternative pathogenetic mechanisms.