Prevalence of tick-borne encephalitis virus in questing Ixodes ricinus nymphs in southern Scandinavia and the possible influence of meteorological factors.

Autor: Lamsal A; Department of Natural Science and Environmental Health, The University of South-Eastern Norway, Bø, Norway.; Department of Virology, Norwegian Institute of Public Health, Oslo, Norway., Edgar KS; Department of Pest Control, Norwegian Institute of Public Health, Oslo, Norway.; Department of Microbiology, Norwegian Veterinary Institute, Ås, Norway., Jenkins A; Department of Natural Science and Environmental Health, The University of South-Eastern Norway, Bø, Norway., Renssen H; Department of Natural Science and Environmental Health, The University of South-Eastern Norway, Bø, Norway., Kjaer LJ; Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg, Denmark., Alfsnes K; Department of Bacteriology, Norwegian Institute of Public Health, Oslo, Norway., Bastakoti S; Department of Virology, Norwegian Institute of Public Health, Oslo, Norway., Dieseth M; Department of Virology, Norwegian Institute of Public Health, Oslo, Norway., Klitgaard K; Department for Diagnostics and Scientific Advice, National Veterinary Institute, Technical University of Denmark, Lyngby, Denmark., Lindstedt HEH; Department of Pest Control, Norwegian Institute of Public Health, Oslo, Norway., Paulsen KM; Department of Virology, Norwegian Institute of Public Health, Oslo, Norway., Vikse R; Department of Virology, Norwegian Institute of Public Health, Oslo, Norway., Korslund L; Department of Natural Sciences, University of Agder, Kristiansand, Norway., Kjelland V; Department of Natural Sciences, University of Agder, Kristiansand, Norway.; Research Unit, Sørlandet Hospital Health Enterprise, Kristiansand, Norway., Stuen S; Department of Production Animal Clinical Sciences, Section of Small Ruminant Research, Norwegian University of Life Sciences, Sandnes, Norway., Kjellander P; Department of Ecology, Grimsö Wildlife Research Station, Swedish University of Agricultural Sciences, Riddarhyttan, Sweden., Christensson M; Department of Ecology, Grimsö Wildlife Research Station, Swedish University of Agricultural Sciences, Riddarhyttan, Sweden., Teräväinen M; Department of Ecology, Grimsö Wildlife Research Station, Swedish University of Agricultural Sciences, Riddarhyttan, Sweden., Jensen LM; Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg, Denmark., Regmi M; Department of Data Science, Kristiania University College, Oslo, Norway., Giri D; School of Arts, Kathmandu University, Dhulikhel, Nepal., Marsteen L; Norwegian Institute for Air Research, Oslo, Norway., Bødker R; Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg, Denmark., Soleng A; Department of Pest Control, Norwegian Institute of Public Health, Oslo, Norway., Andreassen ÅK; Department of Natural Science and Environmental Health, The University of South-Eastern Norway, Bø, Norway.; Department of Virology, Norwegian Institute of Public Health, Oslo, Norway.
Jazyk: angličtina
Zdroj: Zoonoses and public health [Zoonoses Public Health] 2023 Sep; Vol. 70 (6), pp. 473-484. Date of Electronic Publication: 2023 May 29.
DOI: 10.1111/zph.13049
Abstrakt: Ixodes ricinus ticks are Scandinavia's main vector for tick-borne encephalitis virus (TBEV), which infects many people annually. The aims of the present study were (i) to obtain information on the TBEV prevalence in host-seeking I. ricinus collected within the Øresund-Kattegat-Skagerrak (ØKS) region, which lies in southern Norway, southern Sweden and Denmark; (ii) to analyse whether there are potential spatial patterns in the TBEV prevalence; and (iii) to understand the relationship between TBEV prevalence and meteorological factors in southern Scandinavia. Tick nymphs were collected in 2016, in southern Scandinavia, and screened for TBEV, using pools of 10 nymphs, with RT real-time PCR, and positive samples were confirmed with pyrosequencing. Spatial autocorrelation and cluster analysis was performed with Global Moran's I and SatScan to test for spatial patterns and potential local clusters of the TBEV pool prevalence at each of the 50 sites. A climatic analysis was made to correlate parameters such as minimum, mean and maximum temperature, relative humidity and saturation deficit with TBEV pool prevalence. The climatic data were acquired from the nearest meteorological stations for 2015 and 2016. This study confirms the presence of TBEV in 12 out of 30 locations in Denmark, where six were from Jutland, three from Zealand and two from Bornholm and Falster counties. In total, five out of nine sites were positive from southern Sweden. TBEV prevalence of 0.7%, 0.5% and 0.5%, in nymphs, was found at three sites along the Oslofjord (two sites) and northern Skåne region (one site), indicating a potential concern for public health. We report an overall estimated TBEV prevalence of 0.1% in questing I. ricinus nymphs in southern Scandinavia with a region-specific prevalence of 0.1% in Denmark, 0.2% in southern Sweden and 0.1% in southeastern Norway. No evidence of a spatial pattern or local clusters was found in the study region. We found a strong correlation between TBEV prevalence in ticks and relative humidity in Sweden and Norway, which might suggest that humidity has a role in maintaining TBEV prevalence in ticks. TBEV is an emerging tick-borne pathogen in southern Scandinavia, and we recommend further studies to understand the TBEV transmission potential with changing climate in Scandinavia.
(© 2023 The Authors. Zoonoses and Public Health published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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