An outbreak of infection caused by a gentamicin-resistant Staphylococcus aureus

Area of Science:

• Medical Microbiology
• Infectious Diseases
• Hospital Epidemiology

Background:

• An increasing prevalence of antibiotic-resistant bacteria poses a significant threat to public health.
• Staphylococcus aureus is a common cause of hospital-acquired infections, with rising resistance rates.
• Gentamicin and tobramycin are important antibiotics for treating serious Gram-negative infections.

Purpose of the Study:

• To investigate an outbreak of infection caused by a multidrug-resistant Staphylococcus aureus strain.
• To identify risk factors associated with infection by this resistant strain.
• To provide recommendations for controlling the spread of resistant bacteria.

Main Methods:

• Retrospective analysis of patient data from two hospital wards.
• Microbiological investigation to identify the causative pathogen and its resistance profile.
• Case-control study to identify predisposing factors for infection.

Main Results:

• An outbreak of Staphylococcus aureus resistant to gentamicin and tobramycin occurred in two hospital wards.
• Eight patients were colonized, and six developed clinical infections.
• Previous administration of gentamicin was identified as a predisposing factor for infection.

Conclusions:

• Restriction of gentamicin and tobramycin use is crucial to preserve their efficacy.
• Effective infection control measures are necessary to prevent the spread of antibiotic-resistant organisms.
• Judicious antibiotic stewardship is essential in combating antimicrobial resistance.