Distribution of Ixodes ricinus ticks and prevalence of tick-borne encephalitis virus among questing ticks in the Arctic Circle region of northern Norway
| Autor: | D. Gurung, I.E.B. Skjetne, Yohannes B. Okbaldet, Katrine Mørk Paulsen, Åshild Kristine Andreassen, Rose Vikse, Benedikte Nevjen Pedersen, Arnulf Soleng, Kristin Skarsfjord Edgar |
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| Rok vydání: | 2018 |
| Předmět: |
Male
Nymph 0301 basic medicine Veterinary medicine Ixodes ricinus 030231 tropical medicine Distribution (economics) Tick Real-Time Polymerase Chain Reaction Microbiology Encephalitis Viruses Tick-Borne 03 medical and health sciences Northern norway 0302 clinical medicine Prevalence medicine Animals Ixodes biology Arctic Regions Norway business.industry Ricinus biology.organism_classification medicine.disease Tick-borne encephalitis virus 030104 developmental biology Infectious Diseases Insect Science Female Parasitology Seasons business Animal Distribution Encephalitis Tick-Borne Encephalitis |
| Zdroj: | Ticks and Tick-borne Diseases. 9:97-103 |
| ISSN: | 1877-959X |
| DOI: | 10.1016/j.ttbdis.2017.10.002 |
| Popis: | This study investigated the geographical distribution of Ixodes ricinus and prevalence of the tick-borne encephalitis virus (TBEV) in northern Norway. Flagging for questing I. ricinus ticks was performed in areas ranging from Vikna in Nord-Trøndelag County, located 190km south of the Arctic Circle (66.3°N), to Steigen in Nordland County, located 155km north of the Arctic Circle. We found that ticks were abundant in both Vikna (64.5°N) and Brønnøy (65.1°N). Only a few ticks were found at locations ∼66°N, and no ticks were found at several locations up to 67.5°N. Real-time PCR (RT-PCR) analyses of the collected ticks (nymphs and adults) for the presence of TBEV revealed a low prevalence (0.1%) of TBEV among the nymphs collected in Vikna, while a prevalence of 0% to 3% was found among nymphs collected at five locations in Brønnøy. Adult ticks collected in Vikna and Brønnøy had higher rates of TBEV infection (8.6% and 0%-9.0%, respectively) than the nymphs. No evidence of TBEV was found in the few ticks collected further north of Brønnøy. This is the first report of TBEV being detected at locations up to 65.1°N. It remains to be verified whether viable populations of I. ricinus exist at locations north of 66°N. Future studies are warranted to increase our knowledge concerning tick distribution, tick abundance, and tick-borne pathogens in northern Norway. |
| Databáze: | OpenAIRE |
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