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Ramoplanin versus methicillin-resistant Staphylococcus aureus: in vitro experience
W Brumfitt1, P A Maple, J M Hamilton-Miller
1Department of Medical Microbiology, Royal Free Hospital, Hampstead, London, UK.
Drugs Under Experimental and Clinical Research
|January 1, 1990
Summary
Ramoplanin shows high activity and no resistance in Methicillin-resistant Staphylococcus aureus (MRSA) isolates globally. Its rapid bactericidal effect suggests potential for clinical trials against MRSA infections.
Area of Science:
- Microbiology
- Infectious Diseases
- Pharmacology
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) poses a significant global health threat.
- Emerging antibiotic resistance necessitates the development of novel therapeutic agents.
- Ramoplanin is an antibiotic investigated for its efficacy against resistant bacterial strains.
Purpose of the Study:
- To evaluate the in vitro activity of ramoplanin against a diverse collection of MRSA isolates.
- To compare ramoplanin's efficacy with established antibiotics, including vancomycin and ciprofloxacin.
- To assess the prevalence of resistance to ramoplanin and other agents among MRSA strains.
Main Methods:
- Minimum Inhibitory Concentrations (MICs) and Minimum Bactericidal Concentrations (MBCs) were determined using standard plate dilution methods.
- Time-kill kinetics were assessed by monitoring viable bacterial counts over time in broth cultures.
- Susceptibility testing included 162 MRSA isolates from 26 countries, with comparative agents like vancomycin and ciprofloxacin.
Main Results:
- Ramoplanin demonstrated potent activity with MIC90 of 0.5 mg/l and MBC90 of 1.0 mg/l against a selection of MRSA strains.
- No ramoplanin resistance was detected in any of the 162 MRSA isolates tested.
- Ramoplanin exhibited rapid bactericidal activity, achieving 99.9% killing within 4 hours in time-kill experiments.
Conclusions:
- Ramoplanin exhibits significant in vitro activity against a wide range of global MRSA isolates.
- The absence of observed resistance and rapid bactericidal effect highlight ramoplanin's therapeutic potential.
- Further clinical investigation of ramoplanin for MRSA infections is warranted based on these findings.