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First detections of Rickettsia helvetica and R. monacensis in ectoparasitic mites (Laelapidae and Trombiculidae) infesting rodents in south-western Slovakia

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Abstract

Information on circulation of rickettsiae between small mammals and their ectoparasitic mites is scarce. In this study, we investigated infestation rates of rodents with mites in some areas of SW Slovakia and the role of mites as possible vectors of pathogenic rickettsiae. A total of 615 rodents of five species were caught during 2010–2012. All individuals were examined for ectoparasites which resulted in 2821 mites belonging to three species of Laelapidae and six species of Trombiculidae. The most common Laelapidae species was Laelaps agilis (81.25 %), followed by Haemogamasus nidi, and Eulaelaps stabularis. Hirsutiella zachvatkini (16.52 %) was the dominant species of the family Trombiculidae. DNA extracted from rodent blood and ectoparasitic mites was examined for the presence of rickettsiae by PCR. By pooling mites, 345 pool samples were created, of which 112 (32.46 %) were found to be positive for the rickettsial DNA. From 487 examined rodent blood samples, rickettsial DNA was found in 46 (9.44 %). Sequencing DNA from the positive blood samples and mites revealed the identity of Rickettsia helvetica and Rickettsia monacensis. The results of the study suggest that ectoparasitic mites may be reservoirs as well as vectors of some pathogenic rickettsiae.

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Acknowledgments

Authors thank all who helped in molecular methods and participated in the field work, namely Dr. Jana Melničáková, Dr. Eva Špitalská, Renáta Szalayová, Dr. Mirko Slovák, Zuzana Svitálková and Lenka Mahríková. The authors also thank Dr. Ľubomír Vidlička and Dr. Ladislav Roller for preparing photomicrographs. The work was supported by a grant from the Slovak Grant Agency, VEGA 2/0142/10 and grant of the Slovak Research and Development Agency APVV DO7RP–0014–11. The study was partly funded by EU grant FP7-261504 EDENext and is catalogued by the EDENext Steering Committee as EDENext328 (http://www.edenext.eu). The contents of this publication are the sole responsibility of the authors and do not necessarily reflect the views of the European Commission.

Conflict of interest

No competing financial interest exist. The authors declare that there are no conflicts of interest.

Compliance with Ethical Standards

The experiments presented in this paper comply with current laws of the Slovak Republic. Rodent trapping and handling were approved by the Regional Environmental Office in Bratislava (licences ZPO-594/2012-SAB and ZPO-949/2010-SAB).

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Correspondence to Elena Kocianová.

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Miťková, K., Berthová, L., Kalúz, S. et al. First detections of Rickettsia helvetica and R. monacensis in ectoparasitic mites (Laelapidae and Trombiculidae) infesting rodents in south-western Slovakia. Parasitol Res 114, 2465–2472 (2015). https://doi.org/10.1007/s00436-015-4443-x

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