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Volume 26, Number 12—December 2020
Research

Game Animal Density, Climate, and Tick-Borne Encephalitis in Finland, 2007–2017

Timothée DubComments to Author , Jukka Ollgren, Sari Huusko, Ruut Uusitalo, Mika Siljander, Olli Vapalahti, and Jussi Sane
Author affiliations: European Programme for Intervention Epidemiology Training, European Centre for Disease Prevention and Control, Stockholm, Sweden (T. Dub); Finnish institute for Health and Welfare, Helsinki, Finland (T. Dub, J. Ollgren, S. Huusko, J. Sane); University of Helsinki, Helsinki (R. Uusitalo, M. Siljander, O. Vapalahti); Helsinki University Hospital, Helsinki (O. Vapalahti)

Main Article

Table 1

Yearly tick-borne encephalitis incidence increase nationwide and by game management area, Finland 2007–2017

Game management area Median annual no. cases (IQR)† Annual no. cases, range IR (95% CI)
 p value Yearly trend, %
Åland islands 7 (2–11) 1–14 0.97 (0.85–1.10) 0.60 –3%
Etelä-Häme None reported 0–0
Etelä-Savo 0 (0–0) 0–1 1.17 (0.73–1.87) 0.51 +17%
Kaakkois-Suomi 5 (2–6) 1–15 1.28 (1.04–1.32) <0.01 +28%
Kainuu None reported 0–0
Keski-Suomi 0 (0–0) 0–1 1.46 (0.61–3.52) 0.40 +46%
Lappi 2 (1–3) 0–9 1.23 (1.08–1.40) <0.01 +23%
Oulu 0 (0–3) 0–4 1.50 (1.18–1.92) 0.001 +50%
Pohjanmaa None reported 0–0
Pohjois-Häme 0 (0–0) 0–2 1.34 (0.31–5.80) 0.70 +34%
Pohjois-Karjala 0 (0–1) 0–1 1.21 (0.89–1.65) 0.22 +21%
Pohjois-Savo 0 (0–2) 0–3 1.21 (0.96–1.53) 0.11 +21%
Rannikko-Pohjanmaa 1 (0–2) 0–6 0.80 (0.65–1.00) 0.05 –20%
Satakunta 0 (0–0) 0–1 3.00 (0.60–14.87) 0.18 +200%
Uusimaa 4 (1–9) 0–16 1.39 (1.25–1.54) 0.001 +39%
Varsinais-Suomi
 7 (4–17)
 3–28
 1.23 (1.15–1.31)
 0.001
 +23%
Finland 28 (20–50) 17–73 1.15 (1.10–1.20)
 0.001 +15%

*IQR, interquartile range; IR, incidence ratio.
†None reported indicates that 0 cases were reported in that management area over the entire study period.

Main Article

Page created: September 18, 2020
Page updated: November 19, 2020
Page reviewed: November 19, 2020
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