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Monday, July 11, 2011

[AlternativeAnswers] Pathogens of Emerging Tick-Borne Diseases, Anaplasma phagocytophilum, Rickettsi

 




_http://www.liebertonline.com/doi/abs/10.1089/vbz.2010.0215_
(http://www.liebertonline.com/doi/abs/10.1089/vbz.2010.0215)

Vector-Borne and Zoonotic Diseases

Pathogens of Emerging Tick-Borne Diseases, Anaplasma phagocytophilum,
Rickettsia spp., and Babesia spp., in Ixodes Ticks Collected from
Rodents at Four Sites in Switzerland (Canton of Bern)

To cite this article:
Caroline Burri, Christèle Dupasquier, Viktoria Bastic and Lise Gern.

Vector-Borne and Zoonotic Diseases. July 2011, 11(7): 939-944.
doi:10.1089/vbz.2010.0215.

Published in Volume: 11 Issue 7: July 7, 2011

Online Ahead of Print: March 21, 2011

Abstract

This study is part of a project that aimed to better understand the role
of small mammals in the maintenance of the tick-borne encephalitis virus
at four different sites in Switzerland.
Here we focused on the detection of three intracellular pathogens,
Anaplasma phagocytophilum, Rickettsia spp., and Babesia spp., in
field-derived ticks that detached from 79 small mammals. We analyzed 465
Ixodes ricinus larvae after their molt and 14 semiengorged I.
trianguliceps that were feeding on rodents.
No pathogen was detected in I. trianguliceps.
In I. ricinus, the most frequently detected pathogen was Rickettsia spp.
(7.3%). All Rickettsia spp. identified DNA belonged to R. helvetica
except one DNA sample that was identified as R. monacensis.
The prevalence of Babesia spp. reached 2.4% and identification at the
species level revealed B. venatorum (1.7%) and B. microti (0.4%).
A. phagocytophilum was not detected in I. ricinus that detached from
rodents. To verify the absence of A. phagocytophilum at the four sites,
additional questing nymphs collected at these sites were analyzed for A.
phagocytophilum. This pathogen was detected at one site only, where 2%
(2/100) of questing ticks were infected.
Some of these emerging pathogens are described for the first time in
molted larvae that fed on rodents.
The presence of medically relevant pathogens, with a global prevalence
of 9.9%, highlights the importance to inform the medical corporation on
the risk for human health in these areas.

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