L.G. Tarasova - Ph.D. (Med.), Associate Professor, Astrakhan State Medical University E-mail: tarasova_lg@list.ru E.N., Strel\'tsova - Dr. Sc. (Med.), Professor, Head of Department, Astrakhan State Medical University K.M. Galimzyanov - Dr. Sc. (Med.), Professor, Head of Department of Infectious Diseases, Astrakhan State Medical University B.I. Kantemirova - Dr. Sc. (Med.), Director of Research Institute of Regional Infectious Pathology, Astrakhan State Medical University E-mail: agmanauka@mail.ru