Waterhouse-Friderichsen syndrome is seen in:
Pneumococci
N.meningitidis
Pseudomonas
Yersinia
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.