Allergy is a reaction of the immune system to something that does not bother most other people(allergens).
Allergens : They are the substances that causes the allergic or hypersensitivity reactions .They are
- Pollen
- Nickel
- Rubber chemicals
- Dust mites
- Colophony
- Mold spores
- Parabens
- Balsum of peru
- Pet dander
- Food
- Insect stings
- Medicines (e.g. Neomycin)
Types : Allergies are commonly of four types . They are -
- Type 1or Immediate hypersensitivity ( or Anaphylactic)
- Type 2 or Cytotoxic hypersensitivity
- Type 3 or Immune complex disease
- Type 4 or Delayed type hypersensitivity
Type 1 :
- Drug induced
- Antisera induced
- Bee or Wasp stinging
- Bronchial asthma
- Urticaria
- Angioedema
- Food allergy
- Hay fever
Type 2 :
- Transfusion reactions
- HDN ( Haemolytic disease of the newborn )
- ITP ( Immune thrombocytopenic purpura )
- Myasthenia Gravis
- Type 1 diabetes mellitus
- Male sterility
- Graves' Disease
- Hyperacute rejection reaction
- SLE
- Goodpasture syndrome
- Farmer's lung
- Ployarteritis nodosa
- Immune complex glomerulonephritis
- Drug induced vasculitis
- Arthus reaction
- Serum sickness
- Autoimmunity
- Granulomatous diseases
- Contact hypersensitivity
- Transplant rejection reaction
- Reaction against viral & mycobacterial infection
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