References
1. Infectious diseases. National leadership. 2nd ed. Moscow: GEOTAR-Media, 2018: 1104 p. (in Russian)
2. On the state of the sanitary-epidemiological well-being of the population in the Russian Federation in 2018: State report. Moscow: Federal’naya sluzhba po nadzoru v sfere zashchity prav potrebiteley i blago-poluchiya cheloveka, 2019: 254 p. (in Russian)
3. Rodyukova I.S., Vertkin A.L., Outpatient therapy: a new look at the education of a doctor. Ambulatorniy priyom [Outpatient Appointments]; 3 (1): 70-3. (in Russian)
4. Vertkin A., Rumyantsev M., Skotnikov A. Comorbidity in clinical practice. Part 1. Arkhiv vnutrenney meditsiny [Archives of Internal Medicine]. 2011; (1): 16-20. (in Russian)
5. Yushchuk N.D., Klimova E.A. (eds) Infectious diseases: syndromic diagnosis. Moscow: GEOTAR-Media, 2017: 176 p. (in Russian)
6. Yushchuk N.D., Martynov Yu.V. Epidemiology. Moscow: Meditsina, 2003: 450 p. (in Russian)
7. Vertkin A.L., Silina E.G. Infectious diseases. Moscow: Eksmo, 2019. (in Russian)
8. Verktin A.L., Zayratyants O.V., Vovk E.I., Frolova Yu.V., Aristarkhova O.Yu., Lukashov M.I. Clinical and morphological comparisons as a part of a physician’s mastering. Pul’monologiya [Pulmonology]. 2008; (2): 117-25. (in Russian)
9. Rules for the formulation of a pathological diagnosis, selection and coding for ICD-10 causes of death class I. Some infectious and parasitic diseases. Guidelines No. 45. Moscow, 2019: 67 p. (in Russian)
10. Chuchalin A.G. (ed.) Respiratory medicine. Leadership. 2nd ed. Moscow, 2017. (in Russian)
11. Kolobukhina L.V., Shchelkanov M.Yu., Burtseva E.I., et al. Clinical and epidemiological characteristics of influenza A (H1N1) in the epidemiological season 2012-2013 in Moscow. Voprosy virusologii [Problems of Virology]. 2013; (S1): 90-101. (in Russian)
12. Vertkin A.L., Prokhorivich E.A., Namazova L.S., et al. Optimization of empirical therapy of out-of-hospital pneumonia in elderly and old patients. Russkiy meditsinskiy zhurnal [Russian Medical Journal]. 2002; 10 (16): 708-12. (in Russian)