Hypersensitivity reactions

• Diagnosis:
  Type 1 Hypersensitivity reaction
  Type 2 Hypersensitivity reaction
  Type 3 Hypersensitivity reaction
  Type 4 Hypersensitivity reaction
• Pneumonic:
  "A nna C ycled I mmediately D ownhill"
  
  A naphylaxis (type 1)
  C ell-mediated (type 2)
  I mmune-complex (type 3)
  D elayed hypersensitivity (type 4)