Journal article
Antimicrobial susceptibility testing of Brachyspira intermedia and Brachyspira pilosicoli isolates from Australian chickens
Avian Pathology, Vol.35(1), pp.12-16
2006
Abstract
Susceptibilities of predominantly Australian isolates of the pathogenic intestinal spirochaetes Brachyspira intermedia (n=25) and Brachyspira pilosicoli (n=17) from chickens were tested in agar dilution against four concentrations each of the antimicrobials tiamulin, lincomycin, tylosin, metronidazole, tetracycline and ampicillin. Based on available minimum inhibitory concentration (MIC) breakpoint values for Brachyspira hyodysenteriae or other Gram-negative enteric veterinary pathogens, isolates of both species generally were susceptible to tiamulin, lincomycin, metronidazole and tetracycline. Although not classed as resistant, four isolates of B. intermedia had an elevated MIC range for tiamulin (1 to 4 09mg/l), 11 isolates of B. intermedia and five of B. pilosicoli had an elevated MIC range for lincomycin (10 to 50 09mg/l), one isolate of B. pilosicoli had an elevated MIC range for tetracycline (10 to 20 09mg/l), and one isolate of B. intermedia and five of B. pilosicoli had an elevated MIC range for ampicillin (10 to 50 09mg/l). A clear lack of susceptibility to tylosin (MIC 0A> 0A4 09mg/l) was seen in 11 isolates each of B. intermedia and B. pilosicoli, and to ampicillin (MIC 0A> 0A32 09mg/l) in two isolates of B. pilosicoli. These data suggest that some resistance to common antimicrobials exists among intestinal spirochetes obtained from laying hens and supports the need of MIC data for clinical isolates before any treatment is considered.
Details
- Title
- Antimicrobial susceptibility testing of Brachyspira intermedia and Brachyspira pilosicoli isolates from Australian chickens
- Authors/Creators
- D.J. Hampson (Author/Creator) - Murdoch UniversityC.P. Stephens (Author/Creator) - Department of Primary Industries and Fisheries , Toowoomba Veterinary Laboratory, Biosecurity , Toowoomba , Queensland , 4350 , AustraliaS.L. Oxberry (Author/Creator) - Murdoch University
- Publication Details
- Avian Pathology, Vol.35(1), pp.12-16
- Publisher
- Taylor & Francis
- Identifiers
- 991005543585007891
- Copyright
- 2006 Houghton Trust Ltd.
- Murdoch Affiliation
- School of Veterinary and Biomedical Sciences
- Language
- English
- Resource Type
- Journal article
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