The effect of combinations of antibiotics and natural products on the antimicrobial resistance of Staphylococcus aureus and Pseudomonas aeruginosa
Natural Products on the Antimicrobial Resistance of Staphylococcus aureus and Pseudomonas aeruginosa
BENTHAM SCIENCE PUBLISHERS
The growing resistance of bacteria to existing antimicrobial drugs is a major problem, making it essential to find new ways to treat bacterial infections. Sometimes, antibiotics alone are not effective enough. To address this, combining different drugs is often used. One approach is to use a combination of antibiotics and plant extracts or phytochemicals. This combination therapy is particularly useful for patients with serious infections caused by drug-resistant pathogens.
Seven antibiotics (gentamicin, ceftazidime, ciprofloxacin, doxycycline, amoxicillin, ceftriaxone, and azithromycin) were obtained from a local pharmacy. Minimum inhibitory concentrations (MIC) were determined using the broth micro-dilution method. Various antimicrobial combinations were tested on 20 multidrug-resistant (MDR) clinical isolates (10 S. aureus and 10 P. aeruginosa). Additionally, the antibacterial activity of several volatile oils (limonene, rosemary, salvia, thyme, and black pepper), plant extracts (moringa seed, curcumin, and capsicum), and phytochemicals (thymol and chitosan) was evaluated against S. aureus and P. aeruginosa using the broth micro-dilution method.
Our results showed that combining ceftriaxone with ciprofloxacin or gentamicin had a strong synergistic effect against S. aureus. Additionally, combining amoxicillin with ceftazidime reduced the MIC by five to six times. For MDR P. aeruginosa isolates, the combination of azithromycin with doxycycline reduced the MIC of azithromycin by about five to six times. The combination of gentamicin with ceftriaxone was also significant. Among natural compounds, thymol, rosemary oil, curcumin, capsicum, and moringa seed extract showed the highest synergistic activity with the tested antibiotics against S. aureus and P. aeruginosa.
In conclusion, the development of new antibiotics is lacking, so improving existing ones is crucial. Our study indicates that combining antibiotics and antibiotics with natural plant compounds are very promising strategies for tackling complex bacterial resistance.
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JOURNAL
The Open Infectious Diseases Journal
ARTICLE TITLE
The Effect of Combinations of Antibiotics and Natural Products on the Antimicrobial Resistance of Staphylococcus aureus and Pseudomonas aeruginosa
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