Delayed hypersensitivity reaction include all except: (AIIMS Nov 10)
a. Examples of delayed (Type IV) hypersensitivity include tuberculin test, lepromin test, contact dermatitis, acute graft rejection.
b. Arthus reaction is a local type III hypersensitivity reaction.
c. Tuberculin test is a type IV or delayed hypersensitivity reaction mediated by T helper cells and macrophages. There is no involvement of antibodies in this type of hypersensitivity reaction.