A total of 887 adult Ixodes ricinus ticks (469 females and 418 males) from 29
different localities in Sweden were screened for Rickettsia, Anaplasma, and
Coxiella DNA using PCR and then subjected to gene sequencing. Rickettsial DNA
was detected in 9.5-9.6% of the ticks. Most of the positive ticks were infected
with Rickettsia helvetica. One tick harbored another spotted fever rickettsia,
closely related to or identical with R. sibirica not previously found in I.
ricinus nor in Sweden. Six of the ticks (0.7%) were infected with an Anaplasma
sp., presumably A. phagocytophilum. Coxiella burnetii DNA was not detected in
any of the ticks. The detection of R. helvetica and A. phagocytophilum in
several of the localities sampled suggests that these potentially
human-pathogenic agents are common in Sweden.
Copyright © 2011 Elsevier
GmbH. All rights reserved.
http://www.ncbi.nlm.nih.gov/pubmed?t...thern%20Sweden
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