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Volume 28, Number 12—December 2022
Research

Continued Circulation of Tick-Borne Encephalitis Virus Variants and Detection of Novel Transmission Foci, the Netherlands

Helen J. EsserComments to Author , Stephanie M. Lim, Ankje de Vries, Hein Sprong, Dinant J. Dekker, Emily L. Pascoe, Julian W. Bakker, Vanessa Suin, Eelco Franz, Byron E.E. Martina, and Constantianus J.M. Koenraadt
Author affiliations: Wageningen University and Research, Wageningen, the Netherlands (H.J. Esser, D.J. Dekker, E.L. Pascoe, J.W. Bakker, C.J.M. Koenraadt); Artemis One Health Research Institute, Delft, the Netherlands (S.M. Lim, B.E.E. Martina); National Institute for Public Health and the Environment, Bilthoven, the Netherlands (A. de Vries, H. Sprong, E. Franz); Sciensano, Brussels, Belgium (V. Suin)

Main Article

Table 2

Rodents that tested positive for the presence of tick-borne encephalitis virus antibodies by SNT or viral RNA in tissue samples by PCR, the Netherlands, 2018–2020*

Sample ID Species Sex Serologic result† SNT PCR result, 
Ct value Nature area Municipality Year
18–2752
 Apodemus sylvaticus
 M
 Weak positive
 Negative
 Negative
 National Park de Groote Peel
 Peel en Maas
 2018
18–2779
 A. sylvaticus
 F
 Weak positive
 Not tested‡
 Negative
 National Park Sallandse Heuvelrug
 Rijssen-Holten
 2018
18–2829
 A. sylvaticus
 M
 Weak positive
 Negative
 Negative
 National Park Sallandse Heuvelrug
 Hellendoorn
 2018
18–2830
 A. sylvaticus
 F
 Positive
 Negative
 Negative
 National Park Sallandse Heuvelrug
 Hellendoorn
 2018
19–2893
 A. sylvaticus
 F
 Positive
 Not tested‡
 Negative
 National Park Utrechtse Heuvelrug
 Zeist
 2019
19–2895
 A. sylvaticus
 F
 Positive
 Negative
 Negative
 National Park Utrechtse Heuvelrug
 Zeist
 2019
19–2896
 A. sylvaticus
 M
 Positive
 Negative
 Negative
 National Park Utrechtse Heuvelrug
 Zeist
 2019
19–2901
 A. sylvaticus
 M
 Weak positive
 Negative
 Negative
 Springendal
 Tubbergen
 2019
19–2916
 A. sylvaticus
 M
 Positive
 Not tested‡
 Negative
 Nijverdal Garden
 Hellendoorn
 2019
19–2997
 My. glareolus
 M
 Weak positive
 Negative
 Negative
 Natuurpark de Leemputten
 Oost Gelre
 2019
19–3001
 Microtus arvalis
 F
 Negative
 Not tested
 Spleen 30.74, brain 30.09
 Natuurpark de Leemputten
 Oost Gelre
 2019
19–3002
 Mi. arvalis
 F
 Weak positive
 Positive
 Spleen 30.57; brain 28.33
 Natuurpark de Leemputten
 Oost Gelre
 2019
19–3053 Myodes glareolus F Negative Not tested Spleen 35.68; brain negative Rijk van Nijmegen Berg en Dal 2019

*Ct, cycle threshold; SNT, serum neutralization test. †Positive = 3 × ODNC (optical density of the negative control), borderline = 2 × ODNC. ‡Not tested because of too little volume.

Main Article

Page created: September 16, 2022
Page updated: November 21, 2022
Page reviewed: November 21, 2022
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