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Journal of Clinical Microbiology, September 2002, p. 3192-3197, Vol. 40, No. 9
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.9.3192-3197.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Identification of Anaplasma phagocytophila (Formerly Ehrlichia phagocytophila) Variants in Blood from Sheep in Norway

Snorre Stuen,1* Ingrid Van De Pol,2 Karin Bergström,3 and Leo M. Schouls2

Department of Sheep and Goat Research, Norwegian School of Veterinary Science, Sandnes, Norway,2 Research Laboratory for Infectious Diseases, National Institute of Public Health and the Environment, Bilthoven, The Netherlands,1 National Veterinary Institute, Uppsala, Sweden3

Received 11 February 2002/ Returned for modification 2 June 2002/ Accepted 20 June 2002

A total of 41 blood samples were collected from 40 Anaplasma phagocytophila-infected sheep in 11 sheep flocks from four different counties of southern Norway. The presence and nature of the Anaplasma species were identified by microscopic detection of morulae, PCR, reverse line blot hybridization, and 16S rRNA gene sequencing. A. phagocytophila was identified in all of the samples, and sequencing of the 16S rRNA gene revealed the presence of four variants of A. phagocytophila. Two of these variants have been described before, but two were newly identified 16S rRNA variants of this species. A. phagocytophila variant 1 was found in nine flocks, A. phagocytophila variant 2 was found in four flocks, the A. phagocytophila prototype was found in two flocks, and A. phagocytophila variant 5 was found in one flock. In two flocks, some sheep were infected with A. phagocytophila variant 1, whereas others were infected with A. phagocytophila variant 2, and in three animals a double infection with two variants was registered. Analyses of the blood samples revealed that blood from sheep infected with A. phagocytophila variant 2 contained nearly twice as many neutrophils and eight times as many Anaplasma-infected neutrophils as blood from sheep infected with the A. phagocytophila variant 1. Furthermore, only 43% of the A. phagocytophila variant 2-infected sheep displayed antibody responses in an immune fluorescence assay, whereas 93% of the sheep with the A. phagocytophila variant 1-infected sheep were seropositive.

* Corresponding author. Mailing address: Department of Sheep and Goat Research, Norwegian School of Veterinary Science, Kyrkjevegen 332/334, N-4325 Sandnes, Norway. Phone: 4751603510. Fax: 4751603509. E-mail: Snorre.Stuen{at}veths.no.

Journal of Clinical Microbiology, September 2002, p. 3192-3197, Vol. 40, No. 9
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.9.3192-3197.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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