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Fatal Panton-Valentine leukocidin-positive MSSA toxic shock syndrome: a call for rapid virulence detection and

Congcong Zhao1,2, Rongrong Ren3, Wei Wu1,4

  • 1Department of Pharmacy, Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China.

Frontiers in Cellular and Infection Microbiology
|May 28, 2026
PubMed
Abstract

Insights

Panton-Valentine leukocidin (PVL)-producing Staphylococcus aureus can cause severe toxic shock syndrome (TSS). Early de-escalation from vancomycin to beta-lactams and rapid virulence testing are crucial for effective management of PVL-positive MSSA infections.

Area of Science:

  • Infectious Diseases
  • Microbiology
  • Clinical Medicine

Background:

  • Toxic shock syndrome (TSS) is a rare, life-threatening infection.
  • Panton-Valentine leukocidin (PVL)-producing Staphylococcus aureus (MSSA) cases are uncommon and poorly documented.

Purpose of the Study:

  • Enhance understanding of PVL-positive MSSA-induced TSS.
  • Assess optimal antimicrobial strategies for MSSA infections.
  • Minimize therapeutic failure and guide clinical management.

Main Methods:

  • Case report of a 26-year-old female with PVL-positive MSSA-induced TSS.
  • Evaluation of vancomycin vs. beta-lactam therapy (e.g., cefazolin).
  • Integration of clinical course with evidence on severe MSSA infection management.

Main Results:

  • PVL-positive MSSA can present with a severe TSS-like phenotype, including pustulosis and pancytopenia.
  • Early transition to beta-lactam antibiotics (cefazolin) may be beneficial.
  • Virulence gene testing is critical for identifying PVL-positive strains in severe cases.

Conclusions:

  • PVL-positive MSSA infections warrant high clinical suspicion for a toxin-driven process.
  • De-escalation from vancomycin to beta-lactams upon MSSA confirmation is a key strategy.
  • Vigilance, rapid testing, and early management improve outcomes.
Keywords:
Panton-Valentine leukocidinanti-staphylococcal β-lactamscefazolinmethicillin-sensitive Staphylococcus aureustoxic shock syndromevancomycin

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