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A total of 287 adultIxodes ricinus ticks, collected in two regions of southern Germany (Frankonia and Baden-Württemberg) whereBorrelia burgdorferi infections are known to be endemic, were examined for the presence of 16S ribosomal DNA specific for theEhrlichia phagocytophila genogroup,E. chaffeensis ,E. canis , andB. burgdorferi by nested PCR. Totals of 2.2% (6 of 275) and 21.8% (65 of 275) of the ticks were positive for theE. phagocytophila genogroup andB. burgdorferi , respectively. Two ticks (0.7%) were coinfected with both bacteria. Of 12 engorgedI. ricinus ticks collected from two deer, 8 (67%) were positive for theE. phagocytophila genogroup and one (8%) was positive forB. burgdorferi . There was no evidence of infection withE. canis orE. chaffeensis in the investigated tick population. The nucleotide sequences of the 546-bpEhrlichia PCR products differed at one or two positions from the original sequence of the human granulocytic ehrlichiosis (HGE) agent (S.-M. Chen, J. S. Dumler, J. S. Bakken, and D. H. Walker, J. Clin. Microbiol. 32:589–595, 1994). Three groups of sequence variants were detected; two of these were known to occur in other areas in Europe or the United States, whereas one has not been reported before. Thus, in the GermanI. ricinus tick population closely related granulocytic ehrlichiae are prevalent, which might represent variants ofE. phagocytophila or the HGE agent.

Prevalence of Borrelia burgdorferi and Granulocytic and Monocytic Ehrlichiae in Ixodes ricinus Ticks from Southern Germany