Nasal staphylococci in children--a follow-up study

Area of Science:

• Microbiology
• Pediatrics
• Epidemiology

Background:

• Nasal carriage of Staphylococcus aureus is common in the community.
• Longitudinal data on pediatric S. aureus colonization patterns are valuable for understanding transmission dynamics.
• Antibiotic resistance in S. aureus is a growing public health concern.

Purpose of the Study:

• To investigate the prevalence and trends of Staphylococcus aureus nasal carriage in young children.
• To assess the development of antibiotic resistance in S. aureus isolates over time.
• To determine if early-life carriage predicts later colonization.

Main Methods:

• A cohort of infants from two South Wales towns was followed until age five.
• Annual nasal swabs were collected for S. aureus detection.
• Isolates were tested for penicillin resistance.

Main Results:

• S. aureus carriage rates were 10-15% at one year, rising to 41% by age five.
• After age two, approximately 90% of S. aureus isolates were penicillin-resistant.
• Consistent carriage of specific strains was observed year-to-year.
• First-year carriage did not predict five-year carriage status.

Conclusions:

• Pediatric Staphylococcus aureus nasal carriage increases significantly during early childhood.
• Penicillin resistance becomes highly prevalent in pediatric S. aureus isolates by age two.
• Early childhood colonization patterns do not reliably predict long-term carriage status.