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In vitro antibiotic sensitivity of Moraxella species
Chemotherapy
|January 1, 1978
Summary
This study determined antibacterial resistance in Moraxella strains. Beta-lactamase production in Moraxella nonliquefaciens conferred resistance to specific antibiotics, impacting treatment options.
Area of Science:
- Microbiology
- Antimicrobial Resistance
- Clinical Bacteriology
Background:
- Moraxella species are increasingly recognized pathogens.
- Understanding their antimicrobial susceptibility is crucial for effective treatment.
- Beta-lactamase production is a key mechanism of antibiotic resistance.
Purpose of the Study:
- To determine the minimal inhibitory concentrations (MICs) of various antibacterial agents against Moraxella strains.
- To evaluate the reliability of disk diffusion tests for predicting resistance.
- To identify specific resistance patterns, including beta-lactamase production.
Main Methods:
- Minimal inhibitory concentrations (MICs) were determined using a standard plate dilution method.
- 17 different antibacterial agents were tested against 34 Moraxella isolates.
- Disk sensitivity tests were performed for selected antibiotics.
Main Results:
- A strain of Moraxella nonliquefaciens producing beta-lactamase exhibited resistance to ampicillin and carbenicillin, but remained susceptible to cephalothin.
- Several Moraxella strains showed relative resistance to erythromycin and sulfisoxazole.
- Disk sensitivity tests reliably predicted penicillin and erythromycin resistance, but not sulfisoxazole resistance.
Conclusions:
- Beta-lactamase production is a significant factor in Moraxella antibiotic resistance.
- Specific antibiotics like cephalothin may remain effective against beta-lactamase-producing strains.
- Disk diffusion tests are useful for predicting resistance to certain antibiotics but require careful interpretation for others, such as sulfisoxazole.