Mary Wilson
Well-known member
Volume 30, Issue 4, 30/Jan/2025
https://doi.org/10.2807/1560-7917.ES.2025.30.4.2400247
Pascoe Emily L, Bakker Julian W, Wijburg Sara R, de Vries Ankje, Sprong Hein, Marcantonio Matteo, Lang Daniel, Dobler Gerhard, Köhler Clara F, Esser Helen J, Koenraadt Constantianus JM.
Background
Tick-borne encephalitis (TBE) can be a severe neurological disease. Identifying ecological factors that may facilitate tick-borne encephalitis virus (TBEV) circulation in the Netherlands could improve awareness and detection.
Aim
We aimed to identify ecological factors affecting TBEV circulation in the Netherlands and to determine if there is sustained circulation and spread of the virus.
Methods
Between June and September 2021, rodents and ticks from three previously TBEV-positive locations were tested for TBEV by PCR. We sequenced TBEV and compared the sequences with previous and subsequent sequences from the Netherlands and other countries to investigate the spread of TBEV-variants.
Results
We captured 383 rodents, 928 feeding ticks and 1,571 questing Ixodes ticks and detected TBEV from six (three Apodemus sylvaticus and three Clethrionomys glareolus) (2.9%) of 206 tested rodents and two (0.9%) of 215 questing tick pools. Detection of TBEV was associated with questing tick density (Mann–Whitney U test = 81.5; 95% confidence interval (CI): − 3.7–6.3 × 10[SUP]−5[/SUP]; p = 0.05). Tick larvae (odds ratio (OR) = 9.0; 95% CI: 2.8–38.2; p < 0.01) and nymphs (OR = 3.8; 95% CI: 1.3–13.6; p < 0.01) were more frequent on A. sylvaticus than on C. glareolus. Sequence comparisons suggest multiple introductions and local circulation of TBEV but no spread among locations.
Conclusion
Tick-borne encephalitis virus occurs in diverse woodlands in the Netherlands, posing a risk to those frequenting these areas. Surveillance for the early detection and monitoring of TBEV spread, along with public awareness campaigns on preventive measures, should continue. Recognition of TBE symptoms and supportive diagnostics should be made available nationwide.
https://www.eurosurveillance.org/content/10.2807/1560-7917.ES.2025.30.4.2400247#abstract_content
https://doi.org/10.2807/1560-7917.ES.2025.30.4.2400247
Pascoe Emily L, Bakker Julian W, Wijburg Sara R, de Vries Ankje, Sprong Hein, Marcantonio Matteo, Lang Daniel, Dobler Gerhard, Köhler Clara F, Esser Helen J, Koenraadt Constantianus JM.
Background
Tick-borne encephalitis (TBE) can be a severe neurological disease. Identifying ecological factors that may facilitate tick-borne encephalitis virus (TBEV) circulation in the Netherlands could improve awareness and detection.
Aim
We aimed to identify ecological factors affecting TBEV circulation in the Netherlands and to determine if there is sustained circulation and spread of the virus.
Methods
Between June and September 2021, rodents and ticks from three previously TBEV-positive locations were tested for TBEV by PCR. We sequenced TBEV and compared the sequences with previous and subsequent sequences from the Netherlands and other countries to investigate the spread of TBEV-variants.
Results
We captured 383 rodents, 928 feeding ticks and 1,571 questing Ixodes ticks and detected TBEV from six (three Apodemus sylvaticus and three Clethrionomys glareolus) (2.9%) of 206 tested rodents and two (0.9%) of 215 questing tick pools. Detection of TBEV was associated with questing tick density (Mann–Whitney U test = 81.5; 95% confidence interval (CI): − 3.7–6.3 × 10[SUP]−5[/SUP]; p = 0.05). Tick larvae (odds ratio (OR) = 9.0; 95% CI: 2.8–38.2; p < 0.01) and nymphs (OR = 3.8; 95% CI: 1.3–13.6; p < 0.01) were more frequent on A. sylvaticus than on C. glareolus. Sequence comparisons suggest multiple introductions and local circulation of TBEV but no spread among locations.
Conclusion
Tick-borne encephalitis virus occurs in diverse woodlands in the Netherlands, posing a risk to those frequenting these areas. Surveillance for the early detection and monitoring of TBEV spread, along with public awareness campaigns on preventive measures, should continue. Recognition of TBE symptoms and supportive diagnostics should be made available nationwide.
https://www.eurosurveillance.org/content/10.2807/1560-7917.ES.2025.30.4.2400247#abstract_content