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Molecular characterization of an early invasive Staphylococcus epidermidis prosthetic joint infection

Marnie E Rosenthal1, Lisa L Dever, Calin S Moucha

  • 1Section of Infectious Diseases, Department of Internal Medicine, Jersey Shore University Medical Center, Neptune, New Jersey, USA.

Microbial Drug Resistance (Larchmont, N.Y.)
|April 23, 2011
PubMed

Insights

Staphylococcus epidermidis, a common skin bacterium, can cause severe invasive infections, particularly around medical implants. This case highlights its aggressive nature and molecular traits contributing to difficult-to-treat prosthetic hip infections.

Area of Science:

  • Infectious Diseases
  • Microbiology
  • Orthopedic Surgery

Background:

  • Staphylococcus epidermidis is increasingly recognized as a pathogen in foreign body infections.
  • Prosthetic joint infections pose significant clinical challenges due to biofilm formation and antimicrobial resistance.

Observation:

  • A case of aggressive, early-onset prosthetic hip infection caused by Staphylococcus epidermidis with high-grade bacteremia is presented.
  • The clinical presentation mimicked invasive infections typically caused by methicillin-resistant Staphylococcus aureus.

Findings:

  • The isolate possessed a combination of resistance genes (SCCmec type IV).
  • Putative virulence factors (arcA, opp3a), cytolytic peptides (α-type phenol-soluble modulins), and biofilm-associated genes (bhp, aap, β-type phenol-soluble modulins) were identified.
  • These factors likely contribute to the pathogen's ability to cause persistent and difficult-to-eradicate infections.

Implications:

  • Understanding the molecular basis of Staphylococcus epidermidis pathogenicity is crucial for developing targeted therapies.
  • This case underscores the need for vigilance in diagnosing and managing S. epidermidis prosthetic joint infections.
  • Further research into S. epidermidis virulence and resistance mechanisms is warranted to combat invasive device-related infections.

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