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Ecological disturbances in intestinal microflora caused by clinafloxacin, an extended-spectrum quinolone
- Oh, H (author)
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- Nord, C E (author)
- Karolinska Institutet
- Barkholt, L (author)
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- Hedberg, M (author)
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- Springer Science and Business Media LLC, 2000
- 2000
- English.
- In: Infection. Zeitschrift für Klinik und Therapie der Infektionen. - : Springer Science and Business Media LLC. - 0300-8126 .- 1439-0973. ; 28:5, s. 272-277
- Journal article (peer-reviewed)
Abstract
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- Background: The quinolones developed over the past few years have enhanced in vitro activity and a broader spectrum of antimicrobial activity compared to ma ny other antimicrobial agents including the older quinolones. The present study focuses on the effect of clinafloxacin, a member of the new broad-spectrum quinolone class of antibiotics, on the normal intestinal microflora. Subjects and Methods: A total of it healthy volunteers received clinafloxacin orally, zoo mg twice daily for 7 days. Fecal specimens were collected at defined intervals before, during and after the administration in order to study the effect of clinafloxacin on the intestinal microflora and to correlate this effect with fecal clinafloxacin concentrations. Intestinal microorganisms isolated before, during and 2 weeks after clinafloxacin administration were tested for their suseptibility to clinafloxacin. Results: Oral administration of clinafloxacin resulted in high drug levels in feces (mean value 176.2 mg/kg on day 7) and pronounced ecological disturbances. The aerobic microflora was eradicated in 11 of the 12 subjects and the anaerobic microflora was strongly suppressed during administration. There was a significant emergence of clinafloxacin-resistant Bacteroides spp, strains (MIC greater than or equal to 4 mg/ml) during administration. The elevated MIC values still remained 2 weeks after discontinuation of the antibiotic (p < 0.001). Conclusion: The emergence of clinafloxacin-resistant Bacteroides spp. demonstrates the necessity of restricting prescription for particular indications in order to preserve the efficacy of the highly active broad-spectrum quinolones.
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