Repeated isolation of tick-borne encephalitis virus from adult Dermacentor reticulatus ticks in an endemic area in Germany.

Malena Bestehorn
Malena Bestehorn
University of Hohenheim
Gerhard Dobler
Gerhard Dobler
Bundeswehr Institute of Microbiology
Martin Pfeffer
Martin Pfeffer
Institute of Animal Hygiene and Veterinary Public Health

Parasit Vectors 2019 Mar 12;12(1):90. Epub 2019 Mar 12.

Institute of Animal Hygiene and Veterinary Public Health, Faculty of Veterinary Medicine, University of Leipzig, An den Tierkliniken 1, 04103, Leipzig, Germany.

Background: Tick-borne encephalitis (TBE) virus is transmitted to humans and animals through tick bites and is thought to circulate in very strictly defined natural environments called natural foci. The most common tick serving as a vector for the TBE virus in central Europe is Ixodes ricinus; it is rarely found in other tick species and in Dermacentor reticulatus it has, so far, only been reported in Poland.

Methods: Between autumn 2016 and spring 2018 ticks were collected by the flagging method in a new TBE focus in the district of northern Saxony, Germany, outside the known risk areas as defined by the national Robert Koch Institute. Ticks were morphologically identified and tested in pools for the presence of TBE virus using a real-time RT-PCR. TBE virus from positive pools was isolated in A549 cells, and the E gene sequences were determined after conventional RT-PCR, followed by a phylogenetic comparison.

Results: TBE virus was detected in 11 pools, 9 times in flagged adults D. reticulatus (n = 1534; MIR: 0.59%, CI: 0.29-11.3%) and only twice in I. ricinus nymphs (n = 349; MIR: 0.57%, CI: 0.02-2.2%). All other ticks, I. ricinus males (n = 33), females (n = 30) and larvae (n = 58), as well as 5 I. inopinatus (2 females, 3 males) and 14 Haemaphysalis concinna (3 females, 11 nymphs), tested negative for TBE virus. TBE virus was not detected in I. ricinus during the summer, when D. reticulatus is not active. Sequence comparison of the entire E gene of the isolated virus strains resembled each other with only 3 nucleotide differences. The most closely related viral sequences belong to TBE virus strains from Poland and Neustadt an der Waldnaab (county of Neustadt an der Waldnaab, Bavaria), approximately 200 km east and 200 km south-west of the new focus, respectively.

Conclusions: TBE virus was found in northern Saxony, Germany, with similar MIRs in D. reticulatus and I. ricinus, indicating that D. reticulatus plays an equal role to I. ricinus in virus circulation when both tick species are sympatric.

Download full-text PDF

Source Listing

Still can't find the full text of the article?

We can help you send a request to the authors directly.
March 2019
8 Reads

Publication Analysis

Top Keywords

tbe virus
der waldnaab
tick species
neustadt der
virus detected
dermacentor reticulatus
virus strains
saxony germany
northern saxony
tick-borne encephalitis
strains poland
isolated a549
positive pools
poland neustadt
virus positive
a549 cells


(Supplied by CrossRef)
Article in Lancet
EA Gould et al.
Lancet 2008
Article in J Gen Virol
M Ecker et al.
J Gen Virol 1999
Article in Ticks Tick Borne Dis
NM Pukhovskaya et al.
Ticks Tick Borne Dis 2018

A Estrada-Peña et al.

L Chitimia-Dobler et al.
Article in Vaccine
J Süss et al.
Vaccine 2003
Article in Front Public Health
A Rizzoli et al.
Front Public Health 2014
Article in Acta Virol
M Lichard et al.
Acta Virol 1967
Article in Acta Virol
M Gresíková et al.
Acta Virol 1997
Article in Parasitology
M Labuda et al.
Parasitology 2004
Article in Acta Virol
O Kozuch et al.
Acta Virol 1980

Similar Publications