Endotoxin is a component of bacteria that can trigger what clinical effect?

• A. Triggers allergic reactions only
• B. Causes neuron damage
• C. Can trigger septic shock and inflammation
• D. Only causes fever, not shock

Answer: (C)

Endotoxins are components of the outer membrane of Gram-negative bacteria, specifically lipopolysaccharide (LPS). When released, they trigger a strong innate immune response by activating immune cells through the LPS recognition complex (involving LPS-binding protein, CD14, and TLR4/MD-2). This leads to the release of powerful pro-inflammatory cytokines such as TNF-α, IL-1, and IL-6, which drive widespread inflammation. The resulting systemic inflammatory response can cause fever but more importantly can lead to septic shock, with vasodilation, increased vascular permeability, hypotension, and potential organ dysfunction. So endotoxin’s clinical impact is the potential to provoke septic shock and inflammation, not just fever or other isolated effects.