Toxin involvement in staphylococcal scalded skin syndrome

Area of Science:

• Microbiology
• Toxicology
• Dermatology

Background:

• Staphylococcus aureus is a significant pathogen causing various skin conditions in children.
• Staphylococcal scalded skin syndrome (SSSS) encompasses generalized exfoliative syndrome, bullous impetigo, and staphylococcal scarlet fever.
• Toxin production by S. aureus plays a crucial role in disease pathogenesis.

Purpose of the Study:

• To investigate the production of staphylococcal exfoliative toxins (ETA, ETB), toxic shock syndrome toxin-1 (TSST-1), and enterotoxins (A-E) in S. aureus strains.
• To correlate specific toxin profiles with distinct clinical presentations of S. aureus infections in children.
• To differentiate the etiological agents of staphylococcal scarlet fever from SSSS.

Main Methods:

• Analysis of toxin production (ETA, ETB, TSST-1, enterotoxins A-E) in 60 S. aureus isolates.
• Clinical data from children with generalized exfoliative syndrome, bullous impetigo, and staphylococcal scarlet fever were correlated with isolates.
• Subcutaneous injection of bacterial strains into newborn mice to assess pathogenicity (Nikolsky's sign induction).

Main Results:

• All strains from generalized exfoliative syndrome and bullous impetigo produced ETA and/or ETB and induced Nikolsky's sign in mice.
• Only one strain from staphylococcal scarlet fever produced exfoliative toxin.
• The remaining 16 S. aureus strains from staphylococcal scarlet fever produced TSST-1 and/or enterotoxins.

Conclusions:

• Enterotoxins or TSST-1 are more frequently associated with staphylococcal scarlet fever than exfoliative toxins.
• Staphylococcal scarlet fever may represent an abortive form of toxic shock syndrome, not a milder SSSS form.
• Distinct toxin profiles differentiate staphylococcal scarlet fever from other SSSS manifestations.