#hypersensitivity_reaction  an inappropriate and excessive reaction to an allergen (as pollen or dust or animal hair or certain foods); severity ranges from mild allergy to severe systemic reactions leading to anaphylactic shock
  supertype:  hypersensitivity.sensitivity  pathological sensitivity
  subtype:  urtication__urticaria__hives__nettle_rash  an itchy skin eruption characterized by weals with pale interiors and well-defined red margins; usually the result of an allergic response to insect bites or food or drugs
  subtype:  allergy__allergic_reaction  hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensity
     subtype:  food_allergy  allergic reaction to a substance ingested in food
     subtype:  immediate_allergy__immediateallergy__atopy__atopicallergy__typeiallergicreaction  an allergic reaction that becomes apparent in a sensitized person only minutes after contact
     subtype:  serum_sickness__serum_disease  a delayed allergic reaction to the injection of an antiserum caused by an antibody reaction to an antigen in the donor serum
     subtype:  delayed_allergy__type_IV_allergic_reaction  an allergic reaction that becomes apparent only hours after contact
  subtype:  anaphylaxis__anaphylaxi  hypersensitivity reaction to the ingestion or injection of a substance (a protein or drug) resulting from prior contact with a substance
     subtype:  anaphylactic_shock  a severe and rapid and sometimes fatal hypersensitivity reaction to a substance (especially a vaccine or penicillin or shellfish or insect venom) to which the organism has become sensitized by previous exposure
  subtype:  allergic_rhinitis  rhinitis caused by an allergic reaction
     subtype:  hay_fever__hayfever__pollinosis  a seasonal rhinitis resulting from an allergic reaction to pollen

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