Fever and petechiae

• Infectious
  • Bacteremia
  • Borrelia spp.
  • Clostridium spp.
  • Infective endocarditis (many species)
  • Haemophilus influenzae type B
  • Neisseria gonorrhoeae (disseminated gonococcal infection)
  • Neisseria meningitidis (acute or chronic meningococcemia)
  • Pseudomonas aeruginosa
  • Rickettsia prowazekii
  • Rickettsia rickettsii
  • Spirillum minor
  • Streptobacillus moniliformis
  • Staphylococcus aureus (bacteremia)
  • Group A Streptococcus (streptococcal toxic shock syndrome, scarlet fever)
  • Streptococcus pneumoniae (asplenic patient)
  • Vibrio vulnificus
  • Yersinia pestis
  • Viral hemorrhagic fevers
• Non-infectious
  • TTP/HUS
  • Vasculitis (small-vessel): IgA vasulitis (HSP)
  • Hematologic malignancy like leukemia with thrombocytopenia