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1Department of Bacteriology, Institute of Infectious Diseases and Immunology, School of Veterinary Medicine, University of Utrecht, P. O. Box 80.165, 3508 TD Utrecht, The Netherlands
2Department of Parasitology, Institute of Infectious Diseases and Immunology, School of Veterinary Medicine, University of Utrecht, P. O. Box 80.165, 3508 TD Utrecht, The Netherlands
* Corresponding author.
ABSTRACT
The 16S ribosomal DNA sequence of Cowdria ruminantium, the causative agent of heartwater disease in ruminants, was determined. An analysis of this sequence showed that C. ruminantium forms a tight phylogenetic cluster with the canine pathogen Ehrlichia canis and the human pathogen Ehrlichia chaffeensis. Although a close relationship between the genus Cowdria and several members of the tribe Ehrlichieae has been suspected previously, the tight phylogenetic cluster with E. canis and E. chaffeensis is surprising in view of known differences in host preference and target cells.
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