Antimicrobial susceptibility pattern among methicillin resistant Staphylococcus isolates in Assam.

Area of Science:

• Microbiology
• Infectious Diseases
• Antimicrobial Resistance

Background:

• Staphylococcus aureus is a common cause of hospital-acquired infections.
• Methicillin resistance in Staphylococcus aureus (MRSA) poses a significant public health challenge globally.
• Understanding local prevalence and resistance patterns is crucial for effective treatment strategies.

Purpose of the Study:

• To determine the prevalence of methicillin-resistant Staphylococcus aureus (MRSA) and coagulase-negative staphylococci (CoNS) in a referral hospital in Assam.
• To assess antibiotic resistance patterns, particularly multidrug resistance, in MRSA and methicillin-sensitive Staphylococcus aureus (MSSA) isolates.
• To compare ciprofloxacin resistance in Assam with national data.

Main Methods:

• Microbiological analysis of Staphylococcus aureus and coagulase-negative staphylococci isolates.
• Phenotypic detection of methicillin resistance.
• Antibiotic susceptibility testing for various antibiotics, including ciprofloxacin.
• Statistical analysis to compare resistance patterns between MRSA and MSSA.

Main Results:

• A high prevalence of methicillin resistance was observed: 52.9% in Staphylococcus aureus and 15% in coagulase-negative staphylococci.
• Methicillin-resistant strains showed significantly higher resistance to multiple antibiotics (23.2%) compared to methicillin-sensitive strains (6.6%).
• Ciprofloxacin resistance rates were lower than those reported in other regions of India.

Conclusions:

• Methicillin-resistant Staphylococcus aureus is a significant issue in this Assam referral hospital, necessitating enhanced infection control measures.
• The higher multidrug resistance in MRSA strains underscores the need for judicious antibiotic use and development of targeted therapies.
• Lower ciprofloxacin resistance may indicate regional variations, warranting further investigation and surveillance.