The nurse recognizes all of the following as type IV hypersensitivity reactions EXCEPT

  • allergic contact dermatitis.
  • Crohn’s disease.
  • graft versus host disease.
  • penicillin allergy.
Number 4 is correct.
Type IV hypersensitivity reactions are cell mediated and are delayed reactions. Examples of type IV hypersensitivity reactions include allergic contact dermatitis, Crohn’s disease, and graft versus host disease. Others include type I diabetes mellitus, multiple sclerosis, and celiac disease. A penicillin allergy is a type I hypersensitivity reaction.