MRSA in children presenting to hospitals in Birmingham, UK

Area of Science:

• Microbiology
• Infectious Diseases
• Molecular Epidemiology

Background:

• Meticillin-resistant Staphylococcus aureus (MRSA) poses a significant threat in pediatric healthcare settings.
• Distinguishing between community-acquired MRSA (CA-MRSA) and hospital-acquired MRSA (HA-MRSA) is crucial for effective treatment and control.
• Molecular characterization aids in understanding MRSA transmission dynamics and strain evolution.

Purpose of the Study:

• To molecularly characterize MRSA isolates from children presenting to Birmingham hospitals.
• To differentiate between CA-MRSA and HA-MRSA based on established criteria.
• To investigate the genetic relatedness and specific genetic markers of pediatric MRSA isolates.

Main Methods:

• Isolates were collected from pediatric patients (
• Fifty MRSA isolates were classified as CA-MRSA or HA-MRSA using Centers for Disease Control and Prevention (CDC) criteria.
• Susceptibility testing, pulsed-field gel electrophoresis (PFGE), polymerase chain reaction (PCR) for staphylococcal chromosome cassette (SCCmec) typing, and Panton-Valentine leucocidin (PVL) gene detection were performed.

Main Results:

• 62% (31/50) of the MRSA isolates were classified as CA-MRSA.
• 72% of isolates exhibited PFGE band patterns and SCCmec types similar to the EMRSA 15 strain.
• Over 80% of isolates possessed SCCmec type IV; PVL genes were not detected in any isolate.

Conclusions:

• Pediatric CA-MRSA isolates in Birmingham hospitals frequently resemble established hospital epidemic strains.
• The characterized CA-MRSA isolates did not meet criteria for de-novo CA-MRSA based on PFGE, PVL production, and SCCmec analysis.
• Findings suggest that MRSA strains circulating in the community among children in this setting may share common origins with hospital strains.