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  • Title: Meningitis and encephalitis in Poland in 2020.
    Author: Mrozowska-Nyckowska K, Zbrzeźniak J, Paradowska-Stankiewicz I.
    Journal: Przegl Epidemiol; 2022; 76(3):371-384. PubMed ID: 36524880.
    Abstract:
    INTRODUCTION: Meningitis and/or encephalitis are one of the main infectious diseases of the nervous system. These diseases are most commonly caused by bacterial and viral etiological factors. In this publication, meningitis and/or encephalitis caused by Neisseria meningitidis, Streptococcus pneumoniae, Haemophilus influenzae and those with a viral origin - in Poland, most often caused by tick-borne encephalitis virus - are presented in detail. In addition to epidemiological surveillance, immunoprophylaxis in the form of mandatory and recommended vaccinations is used in Poland to prevent these infections. AIM OF THE STUDY: The aim of this study was to to assess the epidemiological situation of meningitis and encephalitis in Poland, in 2020. MATERIAL AND METHODS: To analyse the epidemiological situation of neuroinfections in Poland were used data sent to NIPH NIH - NRI by Voivodeship Sanitary and Epidemiological Stations and published in the annual bulletins: "Infectious diseases and poisonings in Poland in 2020" and "Protective vaccination in Poland in 2020" and individual epidemiological interviews registered in the EpiBaza system. RESULTS: In 2020, a total of 831 cases of meningitis and/or encephalitis were registered in Poland. This is a decrease in incidence of up to 62.9% compared to 2019. For infections of bacterial etiology, including cases of neuroborreliosis (incidence of 2.40 per 100,000), the number of cases decreased by 60.4% (from 931 to 369). In the viral infection group, there was a 64.9% decrease (from 1,318 to 462 cases). Of all registered cases, 56% were infections with a viral etiology. Compared to 2019, the number of cases with an S. pneumoniae etiology decreased by 61.3% and for N. meningitidis by 41.1%. It is interesting to note that, in the case of H. influenzae, we can speak of a 20% increase in cases compared to the previous year. In addition, we can see a decrease in the incidence of tick-borne encephalitis - from 265 in 2019 to 158 in 2020 (a decrease of 40.4%). SUMMARY AND CONCLUSIONS: Overall, a downward trend in incidence was shown for both bacterial and viral meningitis and/or encephalitis. The SARS-CoV-2 pandemic and the introduction of restrictions on personto-person contact and various forms of activity, resulting in a reduction in pathogen transmission, were key to the significant reduction in the number of meningitis and/or encephalitis cases in 2020, but a reduction in the availability of medical facilities or the completeness of case reports due to the burden of anti-epidemic measures on the Sanitary Inspectorate cannot be excluded either. Only in the case of cases caused by H. influenzae was a slight increase observed compared to the previous year (12 versus 10 cases). Meningoencephalitis and/or encephalitis, due to its wide etiological range, poses a major challenge to the health care system, particularly in terms of correct clinical diagnosis.
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