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. 2023 Mar;28(11):2200543.
doi: 10.2807/1560-7917.ES.2023.28.11.2200543.

Spatiotemporal spread of tick-borne encephalitis in the EU/EEA, 2012 to 2020

Jasper Van Heuverswyn  1 , Luisa K Hallmaier-Wacker  1 , Julien Beauté  1 , Joana Gomes Dias  1 , Joana M Haussig  1 , Kristina Busch  2 , Jana Kerlik  3 , Mateusz Markowicz  4 , Henna Mäkelä  5 , Teresa Marie Nygren  6 , Hana Orlíková  7 , Maja Socan  8 , Jakub Zbrzeźniak  9 , Milda Žygutiene  10 , Céline M Gossner  1
Affiliations

Spatiotemporal spread of tick-borne encephalitis in the EU/EEA, 2012 to 2020

Jasper Van Heuverswyn et al. Euro Surveill. 2023 Mar.

Abstract

BackgroundTick-borne encephalitis (TBE) is a vaccine-preventable disease involving the central nervous system. TBE became a notifiable disease on the EU/EEA level in 2012.AimWe aimed to provide an updated epidemiological assessment of TBE in the EU/EEA, focusing on spatiotemporal changes.MethodsWe performed a descriptive analysis of case characteristics, time and location using data of human TBE cases reported by EU/EEA countries to the European Centre for Disease Prevention and Control with disease onset in 2012-2020. We analysed data at EU/EEA, national, and subnational levels and calculated notification rates using Eurostat population data. Regression models were used for temporal analysis.ResultsFrom 2012 to 2020, 19 countries reported 29,974 TBE cases, of which 24,629 (98.6%) were autochthonous. Czechia, Germany and Lithuania reported 52.9% of all cases. The highest notification rates were recorded in Lithuania, Latvia, and Estonia (16.2, 9.5 and 7.5 cases/100,000 population, respectively). Fifty regions from 10 countries, had a notification rate ≥ 5/100,000. There was an increasing trend in number of cases during the study period with an estimated 0.053 additional TBE cases every week. In 2020, 11.5% more TBE cases were reported than predicted based on data from 2016 to 2019. A geographical spread of cases was observed, particularly in regions situated north-west of known endemic regions.ConclusionA close monitoring of ongoing changes to the TBE epidemiological situation in Europe can support the timely adaption of vaccination recommendations. Further analyses to identify populations and geographical areas where vaccination programmes can be of benefit are needed.

Keywords: European Union; Tick-borne encephalitis; epidemiology; public health; surveillance; vaccination.

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Conflict of interest statement

Conflict of interest: Mateusz Markowicz received honoraria from Pfizer and Diasorin for lectures unrelated to this study. All other authors have no conflict of interest to declare.

Figures

Figure 1
Figure 1
Notification rates of autochthonous tick-borne encephalitis cases per 100,000 population, EU/EEA countries, 2012–2020
Figure 2
Figure 2
Tick-borne encephalitis cases by year of first reporting and NUTS levels, EU/EEA countries, 2012–2020
Figure 3
Figure 3
Number of autochthonous tick-borne encephalitis cases reported by week for EU/EEA countries with complete reporting, 2012–2020 (n = 24,629)
See this image and copyright information in PMC

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