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Journal of Clinical Microbiology, March 2000, p. 1002-1007, Vol. 38, No. 3
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

PCR Detection of Granulocytic Ehrlichiae in Ixodes ricinus Ticks and Wild Small Mammals in Western Switzerland

Jorge S. Liz,1,* Laurence Anderes,1 John W. Sumner,2 Robert F. Massung,2 Lise Gern,3 Bernard Rutti,1 and Michel Brossard1

Department of Immunology1 and Department of Parasitology,3 Institute of Zoology, University of Neuchâtel, 2007 Neuchâtel, Switzerland; and Viral and Rickettsial Zoonoses Branch, Division of Viral and Rickettsial Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 303332

Received 9 August 1999/Returned for modification 11 October 1999/Accepted 8 December 1999

The presence of granulocytic ehrlichiae was demonstrated by PCR in Ixodes ricinus ticks and wild small mammals in Switzerland in two areas of endemicity for bovine ehrlichiosis. Six ticks (three females and three nymphs) (1.4%) of 417 I. ricinus ticks collected by flagging vegetation contained ehrlichial DNA. A total of 201 small mammals from five species, wood mouse (Apodemus sylvaticus), yellow-necked mouse (Apodemus flavicollis), earth vole (Pitymys subterraneus), bank vole (Clethrionomys glareolus), and common shrew (Sorex araneus), were trapped. The analysis of I. ricinus mammals collected on 116 small mammals showed that nine C. glareolus voles and two A. sylvaticus mice hosted infected tick larvae. In these rodents, granulocytic ehrlichia infection was also detected in blood, spleen, liver, and ear samples. Further examinations of 190 small mammals without ticks or with noninfected ticks showed the presence of ehrlichial DNA in spleen and other tissues from six additional C. glareolus, three A. flavicollis, and one S. araneus mammals. This study suggests that A. sylvaticus, A. flavicollis, S. araneus, and particularly C. glareolus are likely to be natural reservoirs for granulocytic ehrlichiae. Partial 16S rRNA gene sequences of granulocytic ehrlichiae from ticks and rodents showed a high degree of homology (99 to 100%) with granulocytic ehrlichiae isolated from humans. In contrast, groESL heat shock operon sequence analysis showed a strong divergence (approximately 5%) between the sequences in samples derived from rodents and those derived from samples from questing ticks or from other published ehrlichia sequences. Dual infections with granulocytic ehrlichia and Borrelia burgdorferi were found in ticks and small mammals.


* Corresponding author. Mailing address: Department of Immunology, Institute of Zoology, University of Neuchâtel, Rue Emile-Argand 11, 2007 Neuchâtel, Switzerland. Phone: 41-32-7183016. Fax: 41-32-7183011. E-mail: jorge.liz{at}zool.unine.ch.


Journal of Clinical Microbiology, March 2000, p. 1002-1007, Vol. 38, No. 3
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.



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