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Susceptibility of Gardnerella vaginalis to cephradine
Antimicrobial Agents and Chemotherapy
|September 1, 1983
Abstract:
The activity of cephradine and the influence of pH on its activity against 70 Gardnerella vaginalis strains were determined. Serial dilutions of cephradine (0.062 to 256 micrograms/ml) were incorporated into Dunkelberg agar, inoculated with a Steers replicator, incubated in 5% CO2 for 48 h, and examined. The minimal inhibitory concentrations for 90% of the isolates were 16 and 8.0 micrograms/ml at pH 7.0 to 6.0 and 5.5, respectively.
Insights
Cephradine effectively inhibits Gardnerella vaginalis, with its activity significantly increasing as pH decreases. This finding is crucial for understanding antibiotic efficacy in different vaginal environments.
Area of Science:
- Microbiology
- Pharmacology
- Infectious Diseases
Background:
- Gardnerella vaginalis is a key bacterium associated with bacterial vaginosis.
- Understanding the susceptibility of G. vaginalis to antibiotics is essential for effective treatment.
- Antibiotic activity can be influenced by the local physiological environment, such as pH.
Purpose of the Study:
- To determine the antimicrobial activity of cephradine against Gardnerella vaginalis.
- To investigate the impact of varying pH levels on cephradine's efficacy.
Main Methods:
- Serial dilutions of cephradine were prepared in Dunkelberg agar.
- Seventy clinical isolates of Gardnerella vaginalis were tested.
- Antimicrobial activity was assessed at different pH levels (7.0, 6.0, and 5.5) after incubation.
Main Results:
- Cephradine demonstrated activity against all tested Gardnerella vaginalis strains.
- The minimal inhibitory concentration (MIC) for 90% of isolates was 16 micrograms/ml at pH 7.0 and 6.0.
- The MIC for 90% of isolates decreased to 8.0 micrograms/ml at pH 5.5, indicating enhanced activity.
Conclusions:
- Cephradine exhibits concentration-dependent activity against Gardnerella vaginalis.
- Lower pH environments significantly enhance the in vitro activity of cephradine against Gardnerella vaginalis.
- These findings suggest cephradine's potential utility in treating G. vaginalis infections, particularly in conditions associated with lower vaginal pH.