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Prevalence and subtypes of Ciprofloxacin-resistant Campylobacter spp. in commercial poultry flocks before, during, and after treatment with fluoroquinolones
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Humphrey, T. J., Jorgensen, F., Frost, J. A., Wadda, H., Domingue, G., Elviss, N. C., Griggs, Deborah and Piddock, Laura J. V. (2005) Prevalence and subtypes of Ciprofloxacin-resistant Campylobacter spp. in commercial poultry flocks before, during, and after treatment with fluoroquinolones. Antimicrobial Agents and Chemotherapy, Vol.49 (No.2). pp. 690-698. doi:10.1128/AAC.49.2.690-698.2005 ISSN 0066-4804.
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Official URL: http://dx.doi.org/10.1128/AAC.49.2.690-698.2005
Abstract
Five commercial broiler chicken flocks were treated with either difloxacin or enrofloxacin for a clinically relevant infection, as instructed by a veterinarian. Campylobacters were isolated from individual fecal samples and from samples associated with the broiler environment before, during, and after treatment. Ciprofloxacin-resistant Campylobacter jejuni and/or C. coli strains were detected pretreatment in four flocks, but they constituted a very small proportion of the campylobacters present. When the broilers were treated with a fluoroquinolone, a rapid increase in the proportion of ciprofloxacin-resistant campylobacters was observed. During treatment nearly 100% of campylobacters were resistant, and in some flocks a high proportion of resistant strains persisted for up to 4 weeks after treatment. Prior to treatment a variety of campylobacter subtypes were present. During and after treatment considerable changes in both species and subtype prevalence were observed, but no single fluoroquinolone-resistant clone became dominant. Instead, resistant C. coli strains or a mixture of resistant C. coli and C. jejuni strains became dominant, whereas susceptible C. jejuni strains had usually been dominant prior to treatment. The resistant subtypes which emerged and became dominant were not always the same as those detected pretreatment. The persistence of resistant strains for up to 4 weeks posttreatment has important implications for any strategy designed to avoid the introduction of such strains into the food chain.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School | ||||
| Journal or Publication Title: | Antimicrobial Agents and Chemotherapy | ||||
| Publisher: | American Society for Microbiology | ||||
| ISSN: | 0066-4804 | ||||
| Official Date: | 2005 | ||||
| Dates: |
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| Volume: | Vol.49 | ||||
| Number: | No.2 | ||||
| Page Range: | pp. 690-698 | ||||
| DOI: | 10.1128/AAC.49.2.690-698.2005 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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