Abstract
Rat bite fever is an under-reported, under-diagnosed emerging zoonosis with worldwide distribution. Besides Spirillum minus, Streptobacillus moniliformis is the major causative microorganism although it usually colonises rats without any clinical signs. A group of house rats (Rattus rattus) kept in a zoo exhibition for educational purposes suffered from neurological signs including disorientation, torticollis, stall walking, ataxia and death. Gross pathological and histo-pathological examinations of the investigated rats revealed high-grade otitis interna et media, from which Streptobacillus notomytis was isolated in pure culture or as the predominant microorganism. This case series underlines a previously expressed hypothesis that R. rattus might be naturally colonised with S. notomytis, whereas the traditional rat bite fever organism, S. moniliformis, might be restricted to the Norway rat (Rattus norvegicus). However, the general paucity of Streptobacillus isolates, especially from their respective animal hosts, precludes definitive proof of these host tropisms. This is the first report of S. notomytis detection outside Asia and Australia and the first evidence for its role as a facultative pathogen in house rats.
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Abbreviations
- S. :
-
Streptobacillus
- R. :
-
Rattus
- RBF:
-
Rat bite fever
- T :
-
Type strain
- no/s.:
-
Number/s
- m2 :
-
Square meter
- m3 :
-
Cubic meter
- ELISA:
-
Enzyme linked immunosorbent assay
- Ig:
-
Immune globulin
- µm:
-
Micrometer
- SBA:
-
Columbia agar with 5% sheep blood
- MALDI-TOF MS:
-
Matrix-assisted laser desorption/ionization-time of flight mass spectrometry
- MSP:
-
Main spectra peak lists
- MLVA:
-
Multi locus variable number tandem repeat analysis
- groEL :
-
Chaperonine gene
- gyrB :
-
Gyrase subunit B gene
- recA :
-
Recombinase subunit A gene
- mg/kg:
-
Milligram per kilogram
- bp:
-
Base pair/s
- SNP:
-
Single nucleotide polymorphism
- T:
-
Thymine
- A:
-
Adenine
- CNS:
-
Central nervous system
- 1.0:
-
Male
- 0.1:
-
Female
- 0.0.1:
-
Undetermined sex
- LUA:
-
Landesuntersuchungsanstalt für das Gesundheits- und Veterinärwesen Sachsen
- LHL:
-
Landesbetrieb Hessisches Landeslabor
- IBML:
-
Institut für Bakteriologie und Mykologie Leipzig
- N/A:
-
Not applicable
- EFRE:
-
European Funds of Regional Development
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Acknowledgements
The authors like to thank Anna Mohr, Marie-Luise Sonneborn, Walter Lang and Sassan Schwarz for excellent technical assistance and Ekkehard Hiller, Peter Lasch and Marcel Erhard for a helpful discussion on MALDI spectra harmonisation from different platforms. The LHL is supported by the Hessian Ministry for the Environment, Climate Change, Agriculture and Consumer Protection. The work of Juliane Fornefett, Sophie Funk and Christoph Georg Baums was financially supported by the European Funds of Regional Development (EFRE) and is registered at the “Sächsische AufbauBank” under the Proposal Number 100211188.
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VM, CU, DP, BK, JF, CGB and TE made substantial contributions to conception and design or acquisition of data or analysis and interpretation of data. CU, DP, BK, KE, UK, AF, SF, JF, CGB and TE carried out diagnostics and experiments. VM was in charge of animal care, sample acquisition and therapy. TE drafted the manuscript and all the authors were involved in revising it critically for important intellectual content and approved the final version.
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Michel, V., Ulber, C., Pöhle, D. et al. Clinical infection in house rats (Rattus rattus) caused by Streptobacillus notomytis. Antonie van Leeuwenhoek 111, 1955–1966 (2018). https://doi.org/10.1007/s10482-018-1085-x
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DOI: https://doi.org/10.1007/s10482-018-1085-x