Interferon-gamma (IFN-y) is a pleiotropic lymphokine that have multiple effects on the growth and differentiation of various types of cells associated with innate immunity. IFN-y induces differentiation ofmyeloid cells, stimulates the expression of major histocompatibility complex (MHC) class II and class I antigens, it is a potent activator of macrophages which destroy antigenic molecules penetrating the cell. IFN-y is widely used for the treatment of infectious diseases, cancer, autoimmune and allergic diseases. Studies conducted in Research Institute ofInfluenza indicate that drugs IFN-y can be successfully usedfor prevention of influenza and acute respiratory infection (ARI) during the rise of incidence, as well as for the treatment - the first few days/ hours of the onset. The concomitant use of drugs as IFN-a and IFN-y on influenza and ARI can greatly improve the prophylactic and therapeutic efficacy.

In the paper an analysis of modern chemotherapy preparations for the treatment of influenza is presented, there are given the main characteristics of drugs - mechanisms of action, spectrum of antiviral activity, efficacy parameters. The analysis of the current state of research on the development of anti-influenza drugs has been performed.

The use of immunoglobulin preparations for the postexposure prevention of tick-borne encephalitis as the main therapeutic and prophylactic agent fails to have enough high efficiency. For the postexposure prevention and treatment of tick-borne viral encephalitis the use of preparation tioloroin seems to be appropriate. Objective. To determine the expedience of the use of the preparation tiloron for the emergency prevention of tick-borne viral encephalitis and to evaluate its effectiveness in the treatment of patients with febrile and meningeal forms of this infection. Materials and Methods. The evaluation ofpost-exposure prophylaxis of tick-borne was carried out in two groups of individuals (each group was consisted of 100 cases), suffered from the suction of ticks infected by encephalitis virus. Both groups sought for medical help in the first 48 hours after the moment of the tick suction. None of the victims has not been vaccinated against the disease and had no serological markers of infection. According to existing regulations, patients in both groups received post-exposure prophylaxis antiviral tick immunoglobulin in the standard dose. Patients of the second group additionally received an interferon inducer drug tiloron. For the evaluation of the therapeutic efficacy of the drug tiloron there was executed the analysis of clinical and laboratory picture of verified tick-borne viral encephalitis in 40 patients treated at "Republican Hospital for Infectious Diseases" of the city of Syktyvkar in the period from 2010 to 2015. There were studied the dynamics of clinical symptoms, haematological and biochemical markers, CSF, certain immunological indices: CD4, CD8, CD4/CD8, IgM and IgG. For the comparative assessment of the effectiveness of treatment, all the examined patients were divided into 4 groups depending on the clinical diagnosis and ongoing taken causal treatment. Results. Among the patients received post-exposure prophylaxis with inclusion of the preparation tiloron, the disease developed significantly less often, without the formation offocal forms. The use of tiloron in combination therapy reduced the duration of main clinical manifestations in patients with febrile and meningeal forms of the disease, contributed to a more rapid rehabilitation of cerebrospinal fluid, recovery of subpopulations of T-lymphocytes. Conclusions. Immunomodulating inductor tiloron is effective in complex treatment and prevention of tick-borne viral encephalitis.

In order to evaluate the efficiency and safety of using the drug Ingaron in treatment ofpatients with chronic hepatitis C (CHC) an open, randomized, control comparative study has been performed. We examined of 132 CHC patients aged from 18 to 58 years. All patients were selected into 3 groups depending on the type of therapy. The following drugs: Ribavirin, Alfarona, Ingaron were included in regimens of therapy. The course of the disease in examined CHC patients was characterized by mild clinical symptoms, the presence of the expressed cytolytic syndrome more than in half of the patients (50.8%), high levels of «viral load» in 61.6% of patients with the establishment of a direct correlation between high ALT and viremia levels (r=+0,67). The average level of «viral load» in patients infected with no-1 genotype of hepatitis C, at the start of therapy was 1,4 times higher than in those with genotype 1, amounting to 1,8 x 106 and 1,3 x 106 IU/ml, respectively. Patients infected with HCV genotype 1 and receiving therapy with Ingaron for 24 and 12 weeks, achieved sustained viral response in 65,0% and 80,0% of cases whereas patients infected with «no 1» genotype - in 73,9%, and 84,6% of cases, respectively. At the same time, in patients from the control group the sustained viral response was observed only in 56,0% and 60,0% of cases (1 and «no 1» genotypes, respectively). The inclusion of Ingaron into the classical medical regimen was accompanied by a reduction in the incidence of adverse reactions during treatment.