[Antibiotic sensitivity tests of methicillin-resistant staphylococci]

Area of Science:

• Microbiology
• Infectious Diseases
• Antimicrobial Resistance

Context:

• Staphylococcus aureus is a common pathogen with increasing antibiotic resistance.
• Methicillin-resistant Staphylococcus (MRS) strains pose a significant public health threat.
• Understanding resistance patterns is crucial for effective treatment strategies.

Purpose:

• To investigate and compare antibiotic resistance profiles between Methicillin-resistant Staphylococcus (MRS) and Methicillin-susceptible Staphylococcus (MSS) strains.
• To identify specific antibiotics with high and low resistance rates in MRS strains.
• To evaluate significant differences in resistance between MRS and MSS strains against a panel of 23 antibiotics.

Summary:

• A total of 231 MRS and 76 MSS strains were tested against 23 antibiotics using the Modified Kirby-Bauer Technique.
• Highest resistance in MRS strains was observed for lincomycin (61.0%), clindamycin (59.3%), and ampicillin (56.2%).
• Lowest resistance in MRS strains was found for vancomycin (0.5%), ciprofloxacin (8.2%), and ofloxacin (10.8%).
• MRS strains showed significantly higher resistance to 17 antibiotics compared to MSS strains, with notable exceptions including vancomycin, ciprofloxacin, and ofloxacin.

Impact:

• Provides critical data on antibiotic susceptibility patterns for Staphylococcus strains.
• Highlights the need for judicious antibiotic use to combat rising resistance.
• Informs clinical decision-making for treating infections caused by Staphylococcus aureus.
• Identifies antibiotics that remain effective against prevalent MRS strains.