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Parasit Vectors. 2019 Jul 9;12(1):338. doi: 10.1186/s13071-019-3596-3.

A large-scale screening for the taiga tick, Ixodes persulcatus, and the meadow tick, Dermacentor reticulatus, in southern Scandinavia, 2016.

Author information

1
Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg, Denmark. lenju@sund.ku.dk.
2
Department of Pest Control, Norwegian Institute of Public Health, Oslo, Norway.
3
Department of Virology, Norwegian Institute of Public Health, Oslo, Norway.
4
Department of Production Animal Clinical Sciences, Norwegian University of Life Sciences, Oslo, Norway.
5
Department of Natural Sciences, University of Agder, Kristiansand, Norway.
6
Sørlandet Hospital Health Enterprise, Research Unit, Kristiansand, Norway.
7
Department of Production Animal Clinical Sciences, Section of Small Ruminant Research, Norwegian University of Life Sciences, Sandnes, Norway.
8
Wildlife Ecology Unit, Department of Ecology, Swedish University of Agricultural Sciences, Grimsö, Sweden.
9
Department of Applied Mathematics and Computer Science, Technical University of Denmark, Lyngby, Denmark.
10
Department for Diagnostics and Scientific Advice, National Veterinary Institute, Technical University of Denmark, Lyngby, Denmark.
11
Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg, Denmark.

Abstract

The taiga tick, Ixodes persulcatus, has previously been limited to eastern Europe and northern Asia, but recently its range has expanded to Finland and northern Sweden. The species is of medical importance, as it, along with a string of other pathogens, may carry the Siberian and Far Eastern subtypes of tick-borne encephalitis virus. These subtypes appear to cause more severe disease, with higher fatality rates than the central European subtype. Until recently, the meadow tick, Dermacentor reticulatus, has been absent from Scandinavia, but has now been detected in Denmark, Norway and Sweden. Dermacentor reticulatus carries, along with other pathogens, Babesia canis and Rickettsia raoultii. Babesia canis causes severe and often fatal canine babesiosis, and R. raoultii may cause disease in humans. We collected 600 tick nymphs from each of 50 randomly selected sites in Denmark, southern Norway and south-eastern Sweden in August-September 2016. We tested pools of 10 nymphs in a Fluidigm real time PCR chip to screen for I. persulcatus and D. reticulatus, as well as tick-borne pathogens. Of all the 30,000 nymphs tested, none were I. persulcatus or D. reticulatus. Our results suggest that I. persulcatus is still limited to the northern parts of Sweden, and have not expanded into southern parts of Scandinavia. According to literature reports and supported by our screening results, D. reticulatus may yet only be an occasional guest in Scandinavia without established populations.

KEYWORDS:

Dermacentor reticulatus; Ixodes persulcatus; Siberian and Far Eastern tick-borne encephalitis; Taiga tick; meadow tick; range expansion; southern Scandinavia

PMID:
31288866
PMCID:
PMC6617640
DOI:
10.1186/s13071-019-3596-3
[Indexed for MEDLINE]
Free PMC Article

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