Question:
Toxic shock syndrome, a severe infection characterized by high fever and vomiting is caused by
Toxic shock syndrome, a severe infection characterized by high fever and vomiting is caused by
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TSS -> TSST-1 -> Staphylococcus aureus.
Superantigens bypass the normal specificity of the immune system to cause systemic shock.
Superantigens bypass the normal specificity of the immune system to cause systemic shock.
Updated On: Aug 27, 2026
- Bacillus anthracis
- Staphylococcus aureus
- Streptococcus pyogenes
- Enterococcus faecalis
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
Toxic Shock Syndrome (TSS) is an acute and potentially fatal multisystem disease.
It was first identified in the late 1970s and is characterized by sudden high fever, hypotension, vomiting, diarrhea, and a sunburn-like rash followed by skin peeling.
The question requires identifying the primary pathogenic organism responsible for this condition.
Step 2: Detailed Explanation:
• Primary Pathogen: The majority of TSS cases are caused by Staphylococcus aureus.
This Gram-positive bacterium produces a specific exotoxin known as Toxic Shock Syndrome Toxin-1 (TSST-1).
• Mechanism of Disease: TSST-1 acts as a "superantigen."
Unlike standard antigens, superantigens bridge the MHC class II molecule on antigen-presenting cells directly to the T-cell receptors without being processed.
This causes massive, non-specific T-cell activation (up to 20% of the T-cell population).
• Cytokine Storm: The massive activation leads to an overwhelming release of pro-inflammatory cytokines, including Interleukin-1 (IL-1), IL-2, Tumor Necrosis Factor (TNF), and Interferon-gamma.
This "cytokine storm" causes systemic inflammation, capillary leakage, and multi-organ failure.
• Risk Factors: Historically, it was associated with the use of highly absorbent tampons, but it can also occur through surgical wound infections, burns, or other focal infections.
• Comparison: While Streptococcus pyogenes can cause a similar condition (STSS), S. aureus is the classic causative agent described by the symptoms mentioned in the question.
Step 3: Final Answer:
Based on the medical pathology of the syndrome, the correct organism is Staphylococcus aureus.
Toxic Shock Syndrome (TSS) is an acute and potentially fatal multisystem disease.
It was first identified in the late 1970s and is characterized by sudden high fever, hypotension, vomiting, diarrhea, and a sunburn-like rash followed by skin peeling.
The question requires identifying the primary pathogenic organism responsible for this condition.
Step 2: Detailed Explanation:
• Primary Pathogen: The majority of TSS cases are caused by Staphylococcus aureus.
This Gram-positive bacterium produces a specific exotoxin known as Toxic Shock Syndrome Toxin-1 (TSST-1).
• Mechanism of Disease: TSST-1 acts as a "superantigen."
Unlike standard antigens, superantigens bridge the MHC class II molecule on antigen-presenting cells directly to the T-cell receptors without being processed.
This causes massive, non-specific T-cell activation (up to 20% of the T-cell population).
• Cytokine Storm: The massive activation leads to an overwhelming release of pro-inflammatory cytokines, including Interleukin-1 (IL-1), IL-2, Tumor Necrosis Factor (TNF), and Interferon-gamma.
This "cytokine storm" causes systemic inflammation, capillary leakage, and multi-organ failure.
• Risk Factors: Historically, it was associated with the use of highly absorbent tampons, but it can also occur through surgical wound infections, burns, or other focal infections.
• Comparison: While Streptococcus pyogenes can cause a similar condition (STSS), S. aureus is the classic causative agent described by the symptoms mentioned in the question.
Step 3: Final Answer:
Based on the medical pathology of the syndrome, the correct organism is Staphylococcus aureus.
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