JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Detection of tick-borne pathogens in roe deer (Capreolus capreolus), in questing ticks (Ixodes ricinus), and in ticks infesting roe deer in southern Germany.

The hard tick Ixodes ricinus is the most common tick in Central Europe and plays an important role as a vector of several pathogens. In the complex life cycles of these pathogens, the role of wild animals as natural reservoirs has been discussed. The aims of this study were to investigate the role of roe deer (Capreolus capreolus) as a potential reservoir host for Babesia spp., Anaplasma phagocytophilum, and Rickettsia spp. Therefore, we explored the differences in the infection rates of roe deer and engorged and questing ticks with these pathogens from a single forest site with special attention to coinfection. Blood, spleen, and skin samples of a total of 95 roe deer individuals were screened by molecular methods for these pathogens from September 2010 to January 2012 in the 'Angelberger Forst' (Bavaria, Germany). Moreover, 331 engorged ticks from 44 roe deer individuals and 199 host-seeking ticks from the same area were screened. Altogether, the following prevalence rates and a high diversity of species were detected for the respective pathogens in individual animals and ticks: (i) Babesia spp.: roe deer, 89.5%; engorged ticks, 7.3%; questing ticks: adults, 2.5%, nymphs, 3.3%. Sequencing revealed B. venatorum, B. capreoli, and B. microti. (ii) A. phagocytophilum: roe deer 98.9%; engorged ticks, 86.1%; questing ticks: adults, 8.9%, nymphs, 0.8%. (iii) Rickettsia spp.: roe deer, 0%; engorged ticks, 16.6%; questing ticks: adults, 13.9%, nymphs, 17.5%. Sequencing revealed R. helvetica. Furthermore, several coinfections were detected in both roe deer and ticks. The high prevalence rates of B. capreoli and A. phagocytophilum in roe deer support their role as reservoir hosts for these pathogens, but no evidence for a role of roe deer in the life cycle of R. helvetica could be provided.

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