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Cefoxitin activity against multiply antibiotic-resistance Klebsiella pneumoniae in vitro
Abstract:
Due to the emergence of cephalothin- and gentamicin-resistant Klebsiella pneumoniae at this institution, we investigated the in vitro activity of two new cephalosporin compounds-cefoxitin and cefamandole. Whereas both drugs were active against cephalothin- and gentamicin-susceptible isolates of Klebsiella, only cefoxitin exhibited significant activity against cephalothin- and gentamicin-resistant isolates. Seventeen of 20 (85%) of the cephalothin- and gentamicin-resistant isolates were inhibited by
Insights
Cefoxitin shows significant in vitro activity against cephalothin- and gentamicin-resistant Klebsiella pneumoniae, unlike cefamandole. This new cephalosporin effectively inhibits and kills resistant bacterial isolates, offering a promising therapeutic option.
Area of Science:
- Microbiology
- Infectious Diseases
- Pharmacology
Background:
- Emergence of antibiotic resistance in Klebsiella pneumoniae to cephalothin and gentamicin.
- Need for effective antimicrobial agents against multidrug-resistant bacterial strains.
Purpose of the Study:
- To investigate the in vitro activity of cefoxitin and cefamandole against resistant Klebsiella pneumoniae isolates.
- To compare the efficacy of cefoxitin and cefamandole in inhibiting and killing resistant strains.
Main Methods:
- In vitro susceptibility testing (agar dilution, minimum inhibitory concentration, minimum bactericidal concentration) of cefoxitin and cefamandole.
- Kirby-Bauer disk susceptibility testing.
- Analysis of antibiotic degradation by beta-lactamase.
- Growth curve analysis to assess bacterial killing kinetics.
Main Results:
- Cefoxitin demonstrated significant in vitro activity against 85% of cephalothin- and gentamicin-resistant Klebsiella pneumoniae isolates.
- Cefoxitin was not degraded by beta-lactamase, unlike cefamandole and cephalothin.
- Cefoxitin exhibited rapid killing of resistant isolates, confirmed by growth curves.
Conclusions:
- Cefoxitin is a promising therapeutic option against multidrug-resistant Klebsiella pneumoniae.
- The mechanism of resistance to cephalothin and cefamandole involves beta-lactamase degradation.
- Cefoxitin's stability against beta-lactamase contributes to its effectiveness against resistant strains.