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What is responsible for the endotoxin activity of LPS

  • A.lipid A
  • B.O antigen
  • C.core polysaccharide
  • D.all of the above

Answer: A

Correct answer: lipid A

Lipid A is the endotoxin. Released when gram-negative cells lyse, it triggers macrophages to pour out cytokines, producing fever, hypotension and, in quantity, septic shock. The O antigen and core polysaccharide are antigenic but not themselves toxic.

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