Abstract
Chlamydophila (C.) abortus is the most common infectious abortigenic agent in small domestic ruminants in Switzerland. In contrast, the knowledge about chlamydiae in wild ruminants is scarce. As interactions between livestock and Alpine ibex (Capra i. ibex) occur on alpine pastures, the question raises if wild ruminants could play a role as carriers of chlamydiae. Thus, we investigated the prevalence of chlamydiae in Alpine ibex in Switzerland. In total, 624 sera, 676 eye swabs, 84 organ samples and 51 faecal samples from 664 ibex were investigated. Serum samples were tested by two commercial ELISA kits specific for C. abortus. Eye swabs, organs and faecal samples were examined by a Chlamydiaceae-specific real-time polymerase chain reaction (PCR). Positive cases were further investigated by the ArrayTube (AT) microarray method for chlamydial species determination. Of 624 serum samples investigated, 612 animals were negative, whereas nine sera (1.5%) reacted positively in one of the two tests and three sera showed an inconclusive result. Eye swabs of seven out of 412 ibex (1.7%) were tested positive for Chlamydiaceae by real-time PCR. By AT microarray, Chlamydophila (C.) pecorum was identified in two animals, Chlamydophila (C.) pneumoniae was detected in one animal and a mixed infection with C. abortus and C. pecorum was found in four animals. Organs and faecal samples were all negative by real-time PCR analysis. In summary, we conclude that C. abortus is not a common infectious agent in the Swiss ibex population. To our knowledge, this is the first description of C. pneumoniae in ibex. Further studies are necessary to elucidate the situation in other species of wild ruminants as chamois (Rupicapra r. rupicapra), red deer (Cervus elaphus) and roe deer (Capreolus c. capreolus) in Switzerland.
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Acknowledgements
This study was kindly supported by the Federal Veterinary Office (FVO), Bern, Switzerland (project 1.08.18). Collection of samples of Groups 1 and 2 was financed by the Federal Office of Environment (FOE). We are very grateful to the hunting authorities, game-wardens and hunters for the excellent collaboration and for providing numerous ibex samples. Samples of Group 3 were collected thank to the professional advice of Dr. med. vet. G. Brosi concerning the coordination of the sampling in canton of Grisons, and to the support of Dr. med. vet. G. Bearth and Dr. med. vet. U. Probst who provided the laboratory equipment during field work in this canton. We thank ID Vet diagnostics for the providing of ELISA kits. We are also grateful to Nadine Regenscheit, Mirjam Pewsner, Christian Willisch, Claudio Signer and numerous students and biologists at the FIWI for their assistance in sample collection. Many thanks to the laboratory technical staff of the Institute of Veterinary Pathology and of the Clinical Laboratory, Vetsuisse Faculty, University of Zurich.
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None of the authors (NH, AP, NM, MPR, FM, JF, RT, NB) has a financial or personal relationship with other people or organisations that could inappropriately influence or bias the paper entitled “Alpine ibex (C. i. ibex) is not a reservoir for chlamydial infections of domestic ruminants and humans”.
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Holzwarth, N., Pospischil, A., Marreros, N. et al. Alpine ibex (Capra i. ibex) is not a reservoir for chlamydial infections of domestic ruminants and humans. Eur J Wildl Res 57, 233–240 (2011). https://doi.org/10.1007/s10344-010-0416-7
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DOI: https://doi.org/10.1007/s10344-010-0416-7