Fulminant seems to mead rapid. There is however some articles with both phrases: "fulminant meningococcecemia" (about 5000 Google matches) and "acute meningococcecemia" (about 3000 Google matches).
I am thinking Neisseria meningitidis and its pathogenesis
Portal entry nasopharynx (pili)-> attach epithelium cells -> bloodstream (bacteremia); upper respiratory tract infection -symptoms; may be asymptomatic in transient flora; fulminant meningocococcemia (regardless of meningitis)
What is the difference between the two diseases?