Staphylococcus aureus is the etiological agent of Toxic Shock Syndrome according to the material.

Staphylococcus aureus is the etiological agent of Toxic Shock Syndrome according to the material.

• A. Streptococcus pyogenes
• B. Staphylococcus aureus
• C. Escherichia coli
• D. Pseudomonas aeruginosa

Answer: (B)

Toxic Shock Syndrome is caused by toxins produced by Staphylococcus aureus, most notably the toxin TSST-1. This toxin acts as a superantigen, binding outside the usual antigen-binding groove and linking MHC class II on antigen-presenting cells with T-cell receptors. This bypasses normal antigen specificity and triggers a massive, nonspecific activation of T cells, leading to a cytokine storm with high levels of IL-1, IL-2, TNF-α, and IFN-γ. The result is fever, hypotension, a diffuse rash, desquamation, and potential multi-organ dysfunction. While Streptococcus pyogenes can also cause a toxic shock–like syndrome via different superantigens, the classic etiologic agent described for Toxic Shock Syndrome in this context is Staphylococcus aureus, distinguishing it from the other organisms listed.

Toxic Shock Syndrome is caused by toxins produced by Staphylococcus aureus, most notably the toxin TSST-1. This toxin acts as a superantigen, binding outside the usual antigen-binding groove and linking MHC class II on antigen-presenting cells with T-cell receptors. This bypasses normal antigen specificity and triggers a massive, nonspecific activation of T cells, leading to a cytokine storm with high levels of IL-1, IL-2, TNF-α, and IFN-γ. The result is fever, hypotension, a diffuse rash, desquamation, and potential multi-organ dysfunction. While Streptococcus pyogenes can also cause a toxic shock–like syndrome via different superantigens, the classic etiologic agent described for Toxic Shock Syndrome in this context is Staphylococcus aureus, distinguishing it from the other organisms listed.