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Anaplasmosis in two dogs in France and molecular and phylogenetic characterization of Anaplasma phagocytophilum

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Two dogs in France were diagnosed with Anaplasma phagocytophilum infection by real-time PCR. The most remarkable hematologic and biochemical findings were severe thrombocytopenia, mild neutrophilia, morulae in neutrophils, and increased serum concentration of the α2-globulin fraction detected by agarose gel electrophoresis of serum proteins. Using sequencing of the partial 16S rRNA and ankA genes, molecular characterization of the A. phagocytophilum strains showed that the organisms from both dogs were identical to the European strains isolated from horses and people. Based on phylogenetic analysis, the ankA gene was more discriminating than the 16S rRNA gene in distinguishing the majority of European and American strains of A. phagocytophilum infecting people and animals. Three isolates of A. phagocytophilum, 1 from Spain (cow) and 2 from Norway (sheep and deer), were external to the European and American clades.

Keywords: 16S rRNA; AnkA gene; granulocytic anaplasmosis; phylogeny; real-time PCR; tick-borne

Document Type: Research Article


Affiliations: 1: Laboratoire Vebiotel, Arcueil, France 2: Laboratorio d'Analisi Veterinarie San Marco, Padova, Italy

Publication date: June 1, 2011

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