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Stubberfield E, Pringle M, Landén A, Veldman KT, Geurts Y, Jouy E, Le Devendec L, Rubin JE, Kulathunga DGRS, Kristensen KA, Chanter J, Bollard A, Johnson P, Maycock J, Habighorst-Blome K, Rohde J, Card RM. Validation of an antimicrobial susceptibility testing protocol for Brachyspira hyodysenteriae and Brachyspira pilosicoli in an international ring trial. Vet Microbiol 2020; 244:108645. [PMID: 32402332 DOI: 10.1016/j.vetmic.2020.108645] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 02/27/2020] [Accepted: 03/17/2020] [Indexed: 10/24/2022]
Abstract
Brachyspira hyodysenteriae and Brachyspira pilosicoli cause economically important enteric disease in pigs. Treatment of these infections often includes antimicrobial administration, which can be most effective when therapeutic options are informed by antimicrobial susceptibility testing data. Here we describe a method for broth dilution antimicrobial susceptibility testing of these bacteria, both of which are difficult to culture in vitro. The protocol was evaluated for its fitness for use in an inter-laboratory ring trial involving eight laboratories from seven countries, and employing eleven test strains (5 Brachyspira hyodysenteriae including the type strain B78T and 6 Brachyspira pilosicoli) and six antibiotics. Overall intra- and inter-laboratory reproducibility of this method was very good (>90 % MICs at mode +/- 1 log2). Whole genome sequencing revealed good correspondence between reduced susceptibility and the presence of previously defined antimicrobial resistance determinants. Interestingly, lnu(C) was identified in B. pilosicoli isolates with elevated MICs of lincomycin, whilst tva(B) was associated with elevated MICs of pleuromutilins in this species. We designated two new control strains with MICs lying within currently tested ranges, including for the pleuromutilins, in contrast to the control strain B. hyodysenteriae B78T. These were deposited at the DSMZ-German Collection of Microorganisms and Cell Cultures GmbH. The validation of a standard protocol and identification of new control strains facilitates comparisons between studies, establishment of robust interpretative criteria, and ultimately contributes to rational antimicrobial use when treating infected livestock.
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Affiliation(s)
- E Stubberfield
- Department of Bacteriology, Animal and Plant Health Agency, Weybridge, Surrey, KT15 3NB, United Kingdom
| | - M Pringle
- Department of Animal Health and Antimicrobial Strategies, National Veterinary Institute, SVA, SE-751 89, Uppsala, Sweden
| | - A Landén
- Department of Animal Health and Antimicrobial Strategies, National Veterinary Institute, SVA, SE-751 89, Uppsala, Sweden
| | - K T Veldman
- Department of Bacteriology and Epidemiology, Wageningen Bioveterinary Research, Lelystad, Netherlands
| | - Y Geurts
- Department of Bacteriology and Epidemiology, Wageningen Bioveterinary Research, Lelystad, Netherlands
| | - E Jouy
- Mycoplasmology-Bacteriology-Antimicrobial Resistance Unit, French Agency for Food, Environmental and Occupational Health & Safety (ANSES), Ploufragan, France
| | - L Le Devendec
- Mycoplasmology-Bacteriology-Antimicrobial Resistance Unit, French Agency for Food, Environmental and Occupational Health & Safety (ANSES), Ploufragan, France
| | - J E Rubin
- Department of Veterinary Microbiology, University of Saskatchewan, 52 Campus Drive, Saskatoon, Saskatchewan, S7N 5B4, Canada
| | - D G R S Kulathunga
- Department of Veterinary Microbiology, University of Saskatchewan, 52 Campus Drive, Saskatoon, Saskatchewan, S7N 5B4, Canada
| | - K A Kristensen
- National Food Institute, Technical University of Denmark, 2800, Kgs. Lyngby, Denmark
| | - J Chanter
- Animal and Plant Health Agency, Starcross VIC, Devon, United Kingdom
| | - A Bollard
- VETQAS Quality Assurance Unit, Animal and Plant Health Agency, Sutton Bonington, Leicestershire, United Kingdom
| | - P Johnson
- VETQAS Quality Assurance Unit, Animal and Plant Health Agency, Sutton Bonington, Leicestershire, United Kingdom
| | - J Maycock
- VETQAS Quality Assurance Unit, Animal and Plant Health Agency, Sutton Bonington, Leicestershire, United Kingdom
| | - K Habighorst-Blome
- Institute for Microbiology, University of Veterinary Medicine, Foundation, Bischofsholer Damm 15, 30173, Hannover, Germany
| | - J Rohde
- Institute for Microbiology, University of Veterinary Medicine, Foundation, Bischofsholer Damm 15, 30173, Hannover, Germany
| | - R M Card
- Department of Bacteriology, Animal and Plant Health Agency, Weybridge, Surrey, KT15 3NB, United Kingdom.
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