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Combined action of phosphomycin with streptomycin and gentamicin
Abstract:
The combined action of phosphomycin with streptomycin and gentamicin against 41 strains of Gram-positive micrococci (S. aureus and Str. faecalis) and 87 strains of Gram-negative bacilli (including 38 strains of Pseudomonas) was evaluated. The combination of phosphomycin with streptomycin acted synergistically against 12 strains of Gram-positive micrococci, and the combination of phosphomycin with gentmicin against 10 strains. The combination of phosphomycin with streptomycin acted synergistically against 31% of strains (except Pseudomonas), and the combination of phosphomycin with gentamicin against 65% of strains. Only six of 38 Pseudomonas strains were acted synergistically by phosphamycin with streptomycin, and four by phosphomycin with gentamicin. The results indicate that the combination of phosphomycin with aminoglycoside antibiotics shows greater synergistic activity against Gram-negative strains than against Gram-positive micrococci.
Insights
Phosphomycin combined with aminoglycoside antibiotics like streptomycin and gentamicin shows synergistic effects against bacteria. This combination is more effective against Gram-negative bacteria than Gram-positive strains.
Area of Science:
- Microbiology
- Pharmacology
- Infectious Diseases
Background:
- Antibiotic resistance necessitates the exploration of novel therapeutic combinations.
- Phosphomycin is a broad-spectrum antibiotic with a unique mechanism of action.
- Aminoglycosides (streptomycin, gentamicin) are potent bactericidal antibiotics.
Purpose of the Study:
- To evaluate the synergistic activity of phosphomycin combined with streptomycin and gentamicin.
- To assess the efficacy of these combinations against Gram-positive micrococci and Gram-negative bacilli.
- To compare the synergistic potential against different bacterial species, including Pseudomonas.
Main Methods:
- In vitro evaluation of combined antibiotic action.
- Testing against 41 Gram-positive micrococci strains (Staphylococcus aureus, Streptococcus faecalis).
- Testing against 87 Gram-negative bacilli strains, including 38 Pseudomonas strains.
Main Results:
- Synergistic activity observed for phosphomycin-streptomycin against 12 Gram-positive strains.
- Synergistic activity observed for phosphomycin-gentamicin against 10 Gram-positive strains.
- Phosphomycin-streptomycin showed synergy against 31% of Gram-negative strains (excluding Pseudomonas); phosphomycin-gentamicin showed synergy against 65%.
- Limited synergy was noted against Pseudomonas strains for both combinations (6/38 for streptomycin, 4/38 for gentamicin).
Conclusions:
- The combination of phosphomycin with aminoglycoside antibiotics demonstrates significant synergistic activity.
- This synergistic effect is more pronounced against Gram-negative bacterial strains compared to Gram-positive micrococci.
- Further research into phosphomycin-aminoglycoside combinations may offer new therapeutic strategies, particularly for Gram-negative infections.