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Topicality: The rate of acute bacterial rhinosinusitisis 0,5-2% of all cases of acute rhinosinusitis, however, up to 60 % of patients receive the course of antibiotics since the first day of disease. It is well known that earlier use of antibiotics has almost no effect on the development of bacterial ARS and its complications.The purpose of study was to examine the bacterial spectrum of post-viral RS and evaluate clinical and bac-teriological efficiency of polyvalent bacteriophage in technique of delayed prescribing of antibiotics in comparison with the patients receiving standard APVRS therapy.Material and methods: 155 adult patients with acute post-viral RS participated in the trial who were given either standard therapy or polyvalent bacteriophage in addition to the standard therapy. In conjunction with the treatment, the microbiological composition of nasal microflora was examined and its comparison with clinical dynamics was undertaken. Evaluation criteria: decrease in intensity of disease symptoms evaluated in accordance with MSS scale system during each visit in comparison with the 1st visit, antibiotic prescribing frequency, dynamics of microbiological changes.Outcomes and discussion: The use of polyvalent bacteriophagein addition to the standard therapy of acute post-viral rhinosinusitis as a part of technique of delayed prescribing of antibioticsensures clinically significant decrease in the intensity of rhinorrhea symptoms, nasal congestion and post-nasal drip on the third day of supervision (p&lt;0.05). It reduces the prescription of antibacterial medicines by 20%without negative impact on overall treatment results. Decrease in the number of prescription of antibacterial therapy correlates with the fair reduction in bacterial loadwith Staphylococcus aureus and typical representative of ABRS – S. pneumoniae, Haemophilus influenza and M. catarrhalis. Therefore, the intervention group in comparison with the control group has had “therapeutic advantage” during the first days of treatment which allowed to assess the course of disease as a “positive” and avoid in appropriate use of antibiotics. There have been documented no patients with adverse effects during the course of treatment.Conclusion: polyvalent bacteriophage is a safe and effective medication for additional treatment of acute post-viral rhinosinusitis intended to reduce the use of antibiotics. The inclusion of the medication into the treatment regimen could be recommended to the patients as a part of technique of delayed prescribing of antibiotics.

Clinical and microbiological parallels of delayed prescribing of antibiotics in patients with acute rhinosinusitis