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Genetic research

Molecular Evolution of Methicillin-Resistant Staphylococcus aureus in Pediatric Population

Strategic Insights

— 1 min read

New research in Shanghai, China has revealed significant insights into the genomic epidemiology of methicillin-resistant Staphylococcus aureus (MRSA) in a pediatric population. The comprehensive study, conducted over a decade from 2013 to 2022, utilized whole-genome sequencing to analyze 492 randomly selected MRSA isolates obtained from a pediatric hospital. The findings suggest high genetic diversity and dynamic changes in the molecular epidemiology of pediatric MRSA isolates.

Key Takeaways:

  • The most prevalent MRSA lineages among children in Shanghai were ST59 (37.4%), ST398 (22.4%), ST88 (5.7%), and ST22 (5.5%).
  • ST59 maintained a dominant annual proportion before 2017, but the proportion of ST398 gradually increased from 2013 to 2016, making it a prevalent clone comparable to ST59 after 2017.
  • Among prevalent STs, the SCC structure also experienced dynamic changes, with t437-IV subtype declining in ST59 and being replaced by t172-IV in recent years.
  • In ST398, the t011-V subtype appeared in 2014 and rapidly became the leading subtype.
  • The antibiotic resistance profiles and virulence factors exhibited clone-related features, with ST59 presenting high resistance to erythromycin and clindamycin and ST398 having relatively low resistance to common antimicrobial agents and fewer virulence determinants.
  • Panton-Valentine leucocidin was more common in ST338 and ST1232, whereas toxic shock syndrome toxin was closely associated with ST1 and ST5.
  • MRSA cases could be classified into community- and hospital-associated cases, with highly significant differences in demographic characteristics, clindamycin susceptibility, and virulence genes.

Statistics:

  • 492 MRSA isolates were analyzed through whole-genome sequencing.
  • The study spanned 10 years, from 2013 to 2022.
  • ST59 was the most prevalent lineage at 37.4%.
  • ST398 became a prevalent clone comparable to ST59 after 2017.
  • The t011-V subtype in ST398 emerged as the leading subtype in 2014.

Sources:

  • NewsRx. Tongji University Reports Findings in Staphylococcus aureus (Longitudinal surveillance of the molecular evolution of methicillin-resistant Staphylococcus aureus isolates from pediatric patients in Shanghai, China, from 2013 to 2022). Pediatrics Week. May 17, 2025; p 628.

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