Emergence of virulent methicillin-resistant Staphylococcus aureus strains carrying Panton-Valentine leucocidin genes in The Netherlands

J Clin Microbiol. 2005 Jul;43(7):3341-5. doi: 10.1128/JCM.43.7.3341-3345.2005.

Abstract

Methicillin-resistant Staphylococcus aureus (MRSA) strains carrying the Panton-Valentine leucocidin (PVL) genes have been reported worldwide and are a serious threat to public health. The PVL genes encode a highly potent toxin which is involved in severe skin infections and necrotizing pneumonia, even in previously healthy individuals. We assessed the prevalence of PVL-positive MRSA in The Netherlands for two periods of time: (i) 1987 through 1995 and (ii) 2000 and 2002, and determined their characteristics by using multilocus sequence typing and staphylococcal chromosome cassette (SCCmec) typing. It was found that up to 15% of all MRSA isolates detected in The Netherlands harbored the PVL genes. Most PVL-positive MRSA isolates were obtained from severe soft tissue infections in relatively young individuals. The first PVL-positive MRSA described in The Netherlands, isolated in 1988, was a single-locus variant of the "Berlin" epidemic MRSA clone. The 20 PVL-positive MRSA isolates studied in 2000 and 2002 consisted of five different sequence types (STs) that belonged to four clonal complexes. One of the STs, ST80, is considered to be a widespread European clone and was the most predominant ST (60%) in this study, while ST37 had never been found to be associated with PVL-positive MRSA. Most isolates harbored SCCmec type IV, a supposed marker for community-acquired MRSA. The number and type of virulence-associated genes varied among the different STs.

MeSH terms

  • Bacterial Proteins / genetics
  • Bacterial Toxins
  • Communicable Diseases, Emerging / epidemiology
  • Communicable Diseases, Emerging / microbiology
  • Exotoxins
  • Leukocidins / genetics*
  • Methicillin Resistance*
  • Netherlands / epidemiology
  • Polymerase Chain Reaction
  • Soft Tissue Infections / epidemiology*
  • Soft Tissue Infections / microbiology
  • Staphylococcal Skin Infections / epidemiology*
  • Staphylococcal Skin Infections / microbiology
  • Staphylococcus aureus / classification
  • Staphylococcus aureus / genetics
  • Staphylococcus aureus / pathogenicity*
  • Virulence / genetics

Substances

  • Bacterial Proteins
  • Bacterial Toxins
  • Exotoxins
  • Leukocidins
  • Panton-Valentine leukocidin