Are we still afraid of influenza during the Sars-Cov2 pandemic? - epidemiological analysis of influenza morbidity and vaccination in the 2019/2020 season

Kinga Ruszel, Halina Piecewicz-Szczęsna



Influenza is an infectious respiratory disease that is caused by influenza A and B viruses in humans. Pandemic outbreaks mainly involve type A virus of zoonotic origin. The severity of the pandemic flu depends on many factors, including the virulence of the pandemic virus strain and the level of pre-existing immunity. Symptoms associated with influenza virus infection differ from mild respiratory disease limited to the upper respiratory tract and are characterized by fever, sore throat, runny nose, cough, headache, muscle pain and fatigue, as well as severe and in some cases fatal pneumonia due to influenza virus or secondary bacterial infection of the lower respiratory tract. The influenza virus is quite often subject to modifications, which makes it necessary to formulate an influenza vaccine every year to match the circulating strains. These vaccines are not mandatory and, despite the broadly understood promotion among the public, they are not widely purchased. In addition, the vaccine's effectiveness is quite low in the case of an antigenic mismatch between the vaccine and the circulating strain of the virus, which causes a still high level of illness during the year. In the 2019/2020 season, a significant decrease in the number of influenza cases was observed in Poland and in the world. In this work, we will take a closer look at the numerical values of people with influenza and discuss the possible causes of this decline. Did the Covid-19 pandemic favorably affect the incidence of another virus, such as the influenza virus, and cause its decline, or did it just overshadow the real numbers, put society to sleep, and diverted their attention?


influenza; vaccinations; epidemiology; prevention; morbidity

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Ghebrehewet S, MacPherson P, Ho A. Influenza. BMJ [Internet]. 7 grudzień 2016 [cytowane 9 lipiec 2020];355. Dostępne na:

Influenza (Seasonal) [Internet]. [cytowane 9 lipiec 2020]. Dostępne na:

Hause BM, Collin EA, Liu R, Huang B, Sheng Z, Lu W, i in. Characterization of a novel influenza virus in cattle and Swine: proposal for a new genus in the Orthomyxoviridae family. mBio. 4 marzec 2014;5(2):e00031-00014.

Su S, Fu X, Li G, Kerlin F, Veit M. Novel Influenza D virus: Epidemiology, pathology, evolution and biological characteristics. Virulence. 17 2017;8(8):1580–91.

Taubenberger JK. Influenza’s Newest Trick. mBio [Internet]. 24 grudzień 2019 [cytowane 9 lipiec 2020];10(6). Dostępne na:

Kwon H, Kim Y-I, Park S-J, Kim E-H, Kim S, Si Y-J, i in. A Novel Neuraminidase-Dependent Hemagglutinin Cleavage Mechanism Enables the Systemic Spread of an H7N6 Avian Influenza Virus. mBio [Internet]. 24 grudzień 2019 [cytowane 9 lipiec 2020];10(6). Dostępne na:

Krammer F, Smith GJD, Fouchier RAM, Peiris M, Kedzierska K, Doherty PC, i in. Influenza. Nature Reviews Disease Primers. 28 czerwiec 2018;4(1):1–21.

Molinari N-AM, Ortega-Sanchez IR, Messonnier ML, Thompson WW, Wortley PM, Weintraub E, i in. The annual impact of seasonal influenza in the US: measuring disease burden and costs. Vaccine. 28 czerwiec 2007;25(27):5086–96.

Li C, Freedman M. Seasonal influenza: an overview. J Sch Nurs. luty 2009;25 Suppl 1:4S-12S.

Zachorowania na grypę w Polsce [Internet]. [cytowane 14 lipiec 2020]. Dostępne na:

Zachorowania i podejrzenia zachorowań na grypę w Polsce, 2020, 4D (16). 2020;4.

WHO FLUMART OUTPUTS [Internet]. [cytowane 14 lipiec 2020]. Dostępne na:

Sellers SA, Hagan RS, Hayden FG, Fischer WA. The hidden burden of influenza: A review of the extra-pulmonary complications of influenza infection. Influenza Other Respir Viruses. 2017;11(5):372–93.

Warren-Gash C, Hayward AC, Hemingway H, Denaxas S, Thomas SL, Timmis AD, i in. Influenza infection and risk of acute myocardial infarction in England and Wales: a CALIBER self-controlled case series study. J Infect Dis. 1 grudzień 2012;206(11):1652–9.

Kodama M. Influenza Myocarditis. Circulation Journal. 2010;advpub:1009080891–1009080891.

Ukimura A, Ooi Y, Kanzaki Y, Inomata T, Izumi T. A national survey on myocarditis associated with influenza H1N1pdm2009 in the pandemic and postpandemic season in Japan. Journal of Infection and Chemotherapy. 1 styczeń 2013;19(3):426–31.

Onitsuka H, Imamura T, Miyamoto N, Shibata Y, Kashiwagi T, Ayabe T, i in. Clinical manifestations of influenza a myocarditis during the influenza epidemic of winter 1998-1999. J Cardiol. czerwiec 2001;37(6):315–23.

Kaji M, Kuno H, Turu T, Sato Y, Oizumi K. Elevated serum myosin light chain I in influenza patients. Intern Med. lipiec 2001;40(7):594–7.

Smeeth L, Thomas SL, Hall AJ, Hubbard R, Farrington P, Vallance P. Risk of myocardial infarction and stroke after acute infection or vaccination. N Engl J Med. 16 grudzień 2004;351(25):2611–8.

Bartynski WS, Upadhyaya AR, Boardman JF. Posterior Reversible Encephalopathy Syndrome and Cerebral Vasculopathy Associated With Influenza A Infection: Report of a Case and Review of the Literature. Journal of Computer Assisted Tomography. grudzień 2009;33(6):917–922.

Studahl M. Influenza virus and CNS manifestations. Journal of Clinical Virology. 1 grudzień 2003;28(3):225–32.

Fujimoto S, Kobayashi M, Uemura O, Iwasa M, Ando T, Katoh T, i in. PCR on cerebrospinal fluid to show influenza-associated acute encephalopathy or encephalitis. The Lancet. 12 wrzesień 1998;352(9131):873–5.

Steininger C, Popow-Kraupp T, Laferl H, Seiser A, Gödl I, Djamshidian S, i in. Acute encephalopathy associated with influenza A virus infection. Clin Infect Dis. 1 marzec 2003;36(5):567–74.

Davis LE, Kornfeld M. Influenza A virus and Reye’s syndrome in adults. J Neurol Neurosurg Psychiatry. czerwiec 1980;43(6):516–21.

Siriwardena AN, Gwini SM, Coupland CAC. Influenza vaccination, pneumococcal vaccination and risk of acute myocardial infarction: matched case-control study. CMAJ. 19 październik 2010;182(15):1617–23.


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Journal of Education, Health and Sport formerly Journal of Health Sciences

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1223 Journal of Education, Health and Sport eISSN 2391-8306 7

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ICV 2019 = 100.00 ICV 2018 = 95.95 ICV 2017 = 91.30 ICV 2016 = 84.69 ICV 2015 = 93.34 ICV 2014 = 89.51 Standardized Value: 8.27 ICV 2013: 7.32 ICV 2012: 6.41 ICV 20115.48

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