Norovirus infections in the Czech Republic in 2008–2020
Authors:
P. Pazdiora 1; H. Jelínková 1; N. Bartoníková 2; E. Gartnerová 3; J. Kudová 4; I. Vidličková 5; M. Vrba 6; P. Lenz 7; H. Tomášková 8
Authors‘ workplace:
Ústav epidemiologie Lékařské fakulty v Plzni, UK
1; Oddělení lékařské mikrobiologie, Nemocnice Tomáše Bati ve Zlíně
2; Oddělení laboratorní medicíny, Nemocnice AGEL Prostějov, AGEL Středomoravská nemocniční a. s.
3; Oddělení virologie, sérologie a parazitologie, Ústav mikrobiologie LF a FN v Plzni
4; Oddělení virologie, Zdravotní ústav se sídlem v Ostravě
5; Oddělení klinické mikrobiologie, FN Brno-Bohunice
6; Národní referenční centrum pro analýzu epidemiologických dat, Státní zdravotní ústav v Praze
7; Ústav epidemiologie a ochrany veřejného zdraví, Lékařská fakulta, Ostravská univerzita
8
Published in:
Epidemiol. Mikrobiol. Imunol. 71, 2022, č. 2, s. 78-85
Category:
Original Papers
Overview
Introduction: Noroviruses, together with rotaviruses, are the most common cause of viral gastroenteritis in the Czech Republic (CR). The aim of this study was to analyse data on the incidence of norovirus gastroenteritis in the CR and thus to add to the body of knowledge about its significance.
Material and Methods: A descriptive analysis was performed of the basic characteristics of norovirus gastroenteritis reported under ICD-10 code A08.1 to the Epidat or ISIN electronic infectious diseases information system between 2008 and 2020. On the basis of reports from five microbiological laboratories, weekly data on confirmed cases of norovirus infection from 2010–2020 were analysed. Databases of microbiology laboratories from across the Czech Republic were searched to determine the number of the laboratories where norovirus infections were diagnosed and the methods used for this purpose in 2008–2020.
Results: From 2008 to 2020, 33,575 cases of norovirus gastroenteritis were reported to the infectious diseases information systems, which equates to an annual incidence of 24.5/100,000 population, varying between years from 8.2 to 77.1/100,000. Men accounted for 40.2% of cases with an incidence of 20.1/100,000 compared to 28.8/100,000 recorded in women. Of the total of reported cases, 14,282 patients (42.5%) required hospital admission. Over the whole study period, 7,431 cases of norovirus gastroenteritis were recorded in children under 5 years of age. This age category accounted for 13.7–38.9% of the annual totals of reported cases. The incidences were 101.8/100,000 in children under 5 years of age, 40.1/100,000 in 5-14-year-olds, 12.7/100,000 in 15-64-year-olds, and 38.2/100,000 in the age group 65 years and over. Twenty-four deaths (case fatality rate of 0.07%) were reported as associated with norovirus gastroenteritis at the ages 42-94. In the age categories 15-64 years and 65 years and over, the case fatality rates were 0.02% and 0.24%, respectively.
Over the study period, 274 epidemics occurred, during which 16,893 (50.3%) of the total of 33,575 cases were reported. In the epidemic outbreaks, 1,694 (10.0%) patients required hospital admission. The largest outbreak with 5,248 reported cases in 2015 was associated with contamination of the Prague water supply system.
Norovirus infections were laboratory diagnosed year-round, peaking in the autumn and winter months. They are currently diagnosed by 81 laboratories in the Czech Republic, 90.1% of which use immunochromatographic tests.
Conclusion: The study confirmed the highest incidence of norovirus gastroenteritis among children under 5 years of age and the highest case fatality rate in the age group 65 years and over. Over half of the reported cases were outbreak associated. Most laboratories use immunochromatographic tests. The use of more sensitive laboratory methods would improve diagnosis.
Keywords:
Norovirus – Gastroenteritis – case fatality rate – epidemic – seasonal occurrence – infection in children
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Hygiene and epidemiology Medical virology Clinical microbiologyArticle was published in
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