The efficacy of Triazavirin against the tick-borne encephalitis virus was estimated in the sensitive cell culture vs. the active drug Ribavirin®. In a concentration of 128 mcg/ml Triazavirin was shown active in inhibition of the tick-borne encephalitis virus reproduction (strain Sofiin) by accumulation in the SKEV cell culture.

The behavior of cephalexin in pharmaceutical and biological media was studied by spectrophotometric method. The ranges of linearity and the limits of cephalexin detection were determined. The possibilities of spectrophotometric cephalexin determination in mixed saliva and in blood serum were shown. Optimal conditions of proteins precipitation were revealed. Pharmacokinetic parameters of cephalexin in oral fluid of patients with sinusitis were determined.

Ofloxacin susceptibility was tested with the use of 100 hospital isolates by the disk diffusion method vs. the activity of Oflomelid ointment tested by the cavity method. It was shown that the hospital isolates of all the species were susceptible to the Oflomelid ointment, while susceptibility to ofloxacin was preserved in S.epidermidis, the susceptibility of Acinetobacter spp., E.coli, Proteus spp. being intermediate. Such a difference in the susceptibility of the isolates was evidently due to the properties of polyethylene glycols in the ointment composition.

Nineteen patients with bronchopulmonary infection and myasthenia gravis were enrolled in the study. The microbiological analysis of the specimens of phlegm and bronchial secretion revealed both grampositive and gramnegative bacteria. All the isolates were susceptible to the antibiotic used (cefoperazone/sulbactam). Intravenous immunoglobulins (IvIgs) were used to increase the treatment efficacy, to opsonize the infection foci and to decrease the hospitalization terms. The antibiotic therapy and simultaneous use of intravenous immunoglobulins provided higher clinical efficacy in 16 out of 19 patients (84.2%).

Clinical characteristics of some diseases are defined by the phenotype of metabolic reactions, for example N-acetylation. Genetic polymorphism due to the activity of N-acetyltransferase (N-AT) is common in the majority of human populations. Consequently, persons with «slow» or «fast» acetylation phenotype should be identified. N-AT catalyzes acetylation of a number of medical products. Efficiency of pharmacotherapy is mostly associated with the specific features of medical products biotransformation. The processes of biotransformation with participation of acetyltransferase, monooxygenase or other ferment systems are under the gene control. The aim of the study was to characterize the features of the clinical course of acute respiratory infection complicated by pneumonia as dependent on the acetylation phenotype to predict the character of the disease and optimize the used antibiotic therapy among the native population (Yakut) and the arrived (Russian) in the Far North Regions (Sakha, Yakutia). 112 children with acute respiratory infections complicated by pneumonia and 49 practically healthy ones were examined. For the children with low N-AT activity (less than 30%) it was recommended to be treated with gentamicin which directly takes part in the acetylation and provides the antibiotic therapy efficiency in 80% of the cases. The use of cephalosporin antibiotics (β-lactams), the metabolism of which is not directly connected with acetylation reactions provided the efficiency in 20% of the cases.

Fifty five premature infants with very low body weight were observed as inpatients to assess effectiveness of the nursing. The standard program of the care included: adequate primary resuscitation, respiratory support (use of surfactant), thermal mode, early provision of nutrients with full or partial parenteral nutrition, antimicrobial therapy and if possible early enteral nutrition. The patients of the main group (n=29) along with the standard therapy (the volume of the enteral nutrition of 5 ml or more) were treated orally with liquid probiotic based on E.faecium L3 in a dose of 0.5 ml (5x10⁸ CFU) 3 times a day for 14 days. The control group (n=26) was under the standard therapy. The effectiveness of the infants management was estimated by the frequency of disruption of the nutrition, the frequency of infectious complications, the changes in the hematologic indices, the dynamics of the composition of the intestinal microflora. The infectious complications were evident from perinatal viral infection, intraamniotic infection, necrotizing enterocolitis. In the main group patients there was recorded a significant decrease of the frequency of infectious complications: 20.7% against 53.9% in the control group patients. The use of probiotic strain E.faecium L3 in the preterm infants promoted conservation of the immunomodulatory function of the intestinal indigenic microflora and restricted the growth of the nosocomial flora.

It was thought that antibiotics should be produced by soil microorganisms to inhibit the growth of competitors in natural habitats. Yet it has been shown that antibiotics at subinhibitory concentrations may have a role as signalling molecules providing cell-to-cell communication in bacteria in the environment. Antibiotics modulate gene transcription and regulate gene expression in microbial populations. Subinhibitory concentrations of antibiotics may cause a number of phenotypic and genotypic changes in microorganisms. These transcription changes are dependent on the interaction of antibiotics with macromolecular receptors such as ribosome or RNA-polymerase. Antibiotic signalling and quorum-sensing system are important regulatory mechanisms in bacteria. It was demonstrated that antibiotics interfered with quorum-sensing system.

The use of immunodepressants in the medical practice provided tens of thousands of favourable outcomes of the liver, kidney or heart transplantation and significant success in the treatment of a number of autoimmune diseases. Calcineurine inhibitors (cyclosporine A and tacrolimus) provoke a number of adverse reactions. Among them nephrotoxicity is clinically most dangerous. Complex estimation of the immunological and biochemical indices in the treatment with calcineurine inhibitors is an important precondition for increasing the efficacy of immunodepressive therapy and decreasing the frequency and level of the adverse reactions.