Cited by 34Vector-borne infectious diseasesBartonella species infections researchViral Infections and Vectors

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Serological differentiation of antibodies against Rickettsia helvetica, R. raoultii, R. slovaca, R. monacensis and R. felis in dogs from Germany by a micro-immunofluorescent antibody test

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Abstract

BACKGROUND: Spotted Fever Group (SFG) Rickettsiae can cause febrile diseases with or without rash in humans worldwide. In Germany only limited data are available about their medical significance. Serological screening tests for antibodies against rickettsiae usually only distinguish between SFG and Typhus Group (TG) Rickettsiae due to the strong cross reactivities within the groups. Seroprevalence rates in dogs, as possible sentinels for tick-borne diseases, could serve as an indicator for the distribution of different Rickettsia species. METHODS: In this study, a micro-immunofluorescence assay (micro-IFA) was established for detection and differentiation of antibodies against five Rickettsia species in dogs (R. helvetica, R. raoultii, R. slovaca, R. monacensis and R. felis). Dogs that never left Germany (n = 605) previously investigated with an SFG-ELISA were included in this study and screened at a 1:128 dilution. Endpoint titres of fifty randomly selected seropositive samples of each of the five investigated regions in Germany were determined in order to allow a differentiation of the causative Rickettsia species. Sensitivity and specificity of the micro-IFA were compared with ELISA results of the previous study. RESULTS: A total of 93.9% of the dogs were positive for antibodies of the SFG Rickettsiae at the screening titer of 1:128. Differentiation of SFG Rickettsiae with the micro-IFA was possible in 70.4%, but in 29.6% of the cases the detected antibodies were not differentiable. Considering a clear differentiation by a twofold titre difference between observed reactions, the seroprevalence rates were 66.0% for R. helvetica, 2.8% for R. raoultii, 1.6% for R. slovaca, but no serological reaction could be clearly attributed to R. monacensis or R. felis. No statistically significant regional differences were found for R. helvetica, R. slovaca and R. raoultii comparing the five regions of Germany. Comparison of micro-IFA with ELISA revealed a sensitivity of 82.0% and a specificity of 83.8% for the Rickettsia SFG ELISA. CONCLUSIONS: The micro-IFA is a useful serological tool to differentiate antibodies against different Rickettsia species in dogs. Seroprevalence rates in dogs correspond to the prevalence rates and distribution of Rickettsia-carrying tick species.

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Metadata

Authors
Wächter, M., Wölfel, S., Pfeffer, M., Dobler, G., Kohn, B., Moritz, A., Pachnicke, S., & Silaghi, C.
Affiliations
  • Ludwig-Maximilians-Universität München (DE)
  • German Center for Infection Research (DE)
  • Leipzig University (DE)
  • Freie Universität Berlin (DE)
  • Justus-Liebig-Universität Gießen (DE)
  • Bayer (Germany) (DE)
  • University of Zurich (CH)
Corresponding author
Wächter, Miriam
Venue
Parasites & Vectors
Published
2015
Volume
8
Issue
1
Pages
126
ISSN
1756-3305 (ISSN-L)
OpenAlex
W2114852854
Cited by
34
References
0
Citations by year
2026: 1 · 2025: 1 · 2024: 2 · 2023: 3 · 2022: 1 · 2021: 4 · 2020: 3 · 2019: 3 · 2018: 6 · 2017: 2 · 2016: 6 · 2015: 2
FWCI
4.25
Type
journal article
Language
en
Open access
Locations
  • Parasites & Vectors (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
  • Open access LMU (Ludwid Maxmilian's Universitat Munchen) (submittedVersion)
  • Refubium (Universitätsbibliothek der Freien Universität Berlin) (submittedVersion, cc-by)
Funders
  • Universität Hohenheim
  • Bayer HealthCare
  • Freie Universität Berlin
  • Veterinärmedizinische Universität Wien
  • Bayer Vital
Topics
  • Life Sciences › Immunology and Microbiology › Parasitology › Vector-borne infectious diseases
  • Health Sciences › Medicine › Infectious Diseases › Bartonella species infections research
  • Health Sciences › Medicine › Infectious Diseases › Viral Infections and Vectors
Keywords
Rickettsia helvetica, Rickettsia raoultii, Rickettsia slovaca, Rickettsia monacensis, Rickettsia felis, spotted fever group rickettsiae, serological differentiation, seroprevalence, dogs as sentinels, tick-borne diseases, cross-reactivity, ELISA comparison, Germany
MeSH terms
Animals, Antibodies, Bacterial, Cats, DNA, Bacterial, Dogs, Germany, Humans, Rickettsia, Rickettsia Infections, Ticks, Seroepidemiologic Studies, Tick-Borne Diseases, Felis

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