Colonization with coagulase-negative staphylococci in two neonatal units

Area of Science:

• Neonatal Medicine
• Infectious Diseases
• Microbiology

Background:

• Coagulase-negative staphylococci (CNS) are a significant cause of neonatal infections, particularly in intensive care settings.
• Differences in CNS colonization and resistance patterns were observed between Level II and Level III neonatal units.

Purpose of the Study:

• To investigate CNS colonization in neonates across different care levels.
• To correlate CNS colonization and antimicrobial resistance with antibiotic usage patterns.

Main Methods:

• Colonization with CNS was studied in 10 infants from Level II and Level III neonatal units.
• Antimicrobial susceptibility testing was performed on CNS isolates.
• Isolates were characterized using DNA typing (plasmid and genomic).

Main Results:

• Infants were frequently colonized with multiple CNS strains and species, with patient-to-patient transmission observed.
• Antibiotic usage did not correlate with the extent or pattern of CNS colonization.
• Higher prevalence of resistant CNS isolates, primarily Staphylococcus haemolyticus, was found in the Level II unit despite lower antibiotic use.
• Staphylococcus epidermidis, a more virulent species, was more prevalent in the Level III unit, which cared for sicker infants and performed more invasive procedures.

Conclusions:

• CNS colonization and transmission are common in neonatal units.
• Antimicrobial resistance patterns in CNS may not be solely driven by local antibiotic usage.
• The prevalence of specific CNS species and their resistance profiles may be influenced by patient acuity and healthcare practices.