The main data of immunity were studied in 40 patients with infiltrative pulmonary tuberculosis, 40 patients with pneumonia and in 25 healthy volunteers for the purpose of definition of indicators which can be used for differential diagnosis of these diseases. It was established that the most important indicators are levels IgA, IgE, CIC, which essentially raise in patients with pneumonia in comparison with healthy group and patients with tuberculosis. The rest immunological values do not essentially differ.
