Panton-Valentine leukocidin (PVL) gene carriage among Staphylococcus aureus strains with SCCmec types I, III, IV, and V recovered from cystic fibrosis pediatric patients in Brazil

Diagn Microbiol Infect Dis. 2014 Jan;78(1):59-62. doi: 10.1016/j.diagmicrobio.2013.10.004. Epub 2013 Oct 14.


The prevalence of methicillin-resistant Staphylococcus aureus (MRSA) is increasing in patients with cystic fibrosis (CF). We report a molecular characterization, antimicrobial resistance, and Panton-Valentine leukocidin (PVL) toxin gene detection of MRSA strains from 28 Brazilian pediatric CF patients (1 strain per patient). A significant proportion (50%) of MRSA SCCmec IV isolates was observed. Nearly half of MRSA strains harboring the PVL genes distributed in all SCCmec types detected. Multilocus sequence typing (MLST) analyses showed majority (57.1%) of the isolates belonged to known epidemic lineages, such as UK/EMRSA-3, Pediatric/USA 800, Southwest Pacific clone, and Brazilian/Hungarian clone. To our knowledge, this is the first Brazilian study of molecular epidemiology based on MLST and SCCmec typing and the first description of PVL genes in MRSA from CF patients.

Keywords: Cystic fibrosis; MLST; MRSA; PVL; SCCmec; Staphylococcus aureus.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bacterial Toxins / genetics*
  • Brazil / epidemiology
  • Cystic Fibrosis / complications*
  • Exotoxins / genetics*
  • Genotype
  • Humans
  • Leukocidins / genetics*
  • Methicillin-Resistant Staphylococcus aureus / genetics*
  • Methicillin-Resistant Staphylococcus aureus / isolation & purification*
  • Molecular Epidemiology
  • Molecular Typing
  • Prevalence
  • Staphylococcal Infections / microbiology*
  • Virulence Factors / genetics*


  • Bacterial Toxins
  • Exotoxins
  • Leukocidins
  • Panton-Valentine leukocidin
  • Virulence Factors