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What is Waterhouse-Friderichsen syndrome is seen in: and explain in detail?
Fulminant meningococcemia (purpura fulminans or Waterhouse – Friderichsen syndrome) is the most rapidly lethal form of septic shock experienced by humans. 
It diﬀers from most other form of septic shock by the prominence of hemorrhagic skin lesions (petechiae, purpura) and the consistent development of DIC.