hypersensitivity of the immunological system in the body .
allergy is the abnormal secretion of the antibody in the immune system that can be tolerated and harmless to the body .

explanation allergen (pollen grain or dust ) up on entering the body , the epithelium linning of the skin and lungs induce chemical (langerhan) from the defense system. transfer of the langerans in the serum brings production of ige type antibody
ANTIBODY IN THE HUMAN BLOOD
there are five different types of anti bodies are functional in the humamn body . these are IGA . IGM . IGE , IGD AND IGG . IGM , IGA , IGE PROTECTS AGAINST diseases. in case of ige antibody stimulates allergy reaction
the extact reason of its production is un known but genetic predisposition may lead this momentary abnormality.
sensitization
in this process allergen attaches with the fab portion of antigen and induces allergic reaction .
phases of allergic
there are two phases of allergic one phase includes sneezing , itching nose and mucous secretion it phase last for 8 hour . the late phase in which inflammation may be occur and this period prolonged for one week.

this diagram will help in understanding

allergen >antibodyIgE>mast cell ,basophile>mediator>inflammation >signs and symptom.

vaccination and precautions
anti histamines
histamines induces during process of antibody , it is useful for temporary treatment
inflammation treatment
nasal steroid is the best available cure for this late phase .
precaution measures
HEPA HIGH EFFICIENCY PARTICULATE ARRESTOR
ULPA ULTRA LOW PENETRATION AIR

CLEANING AND THE CHANGING FILTER OF AIR CONDITION .