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Changing phage typing patterns of epidemic gentamicin-resistant Staphylococcus aureus. Evidence for transmission of
Insights
An outbreak of gentamicin-resistant Staphylococcus aureus occurred in a hospital over 10 weeks. This suggests potential in vivo transfer of gentamicin resistance between Staphylococcus aureus strains.
Area of Science:
- Infectious Diseases
- Microbiology
- Hospital Epidemiology
Background:
- Gentamicin resistance in Staphylococcus aureus poses a significant threat to patient care.
- Hospital-acquired infections require continuous monitoring and control strategies.
Purpose of the Study:
- To investigate an outbreak of gentamicin-resistant Staphylococcus aureus within a hospital setting.
- To characterize the epidemiological and microbiological features of the outbreak.
Main Methods:
- Surveillance of Staphylococcus aureus infections over a 10-week period.
- Phage susceptibility typing of gentamicin-resistant isolates.
- Analysis of infection patterns among adult, infant, and medical staff populations.
Main Results:
- Twenty-four cases of gentamicin-resistant Staphylococcus aureus infection were identified.
- Infections initially affected medical staff, followed by 16 infants in the neonatal intensive-care unit.
- Isolates exhibited three distinct phage susceptibility patterns across different outbreak phases.
Conclusions:
- The outbreak suggests a potential for in vivo transfer of gentamicin resistance between Staphylococcus aureus strains.
- Further in vitro and in vivo studies are warranted to confirm resistance transfer mechanisms.
- Effective infection control measures are crucial to prevent the spread of resistant bacteria in healthcare settings.
Abstract:
In a 10-week period, infection with gentamicin resistant Staphylococcus aureus appeared in 24 adults and infants in one hospital. Medical staff were affected first, and subsequently 16 infants in the neonatal intensive-care unit. The gentamicin-resistant staphyloccal isolates showed three distinct phage susceptibility patterns in two distinct phage groups during the early, middle, and late phases of the outbreak. Although not confirmed with in-vitro or in-vivo laboratory data, this outbreak suggests that gentamicin resistance may be transferred between different strains of Staph. aureus in vivo.