An allergy is an abnormal sensitivity to an allergen that is inhaled, eaten or touched that most of other people can tolerate with no trouble. Allergies are over-reactions to substances one's immune system considers harmful.
If both parents have respiratory allergies then risk that their offspring’s develop an allergy goes up by 80%. The increased tendency of some families to develop allergy sensitization is termed asatopy: atopic dermatitis (eczema), hay fever (seasonal allergic rhinitis) and allergic asthma. Atopic individuals are generally prone to manufacture allergy antibodies (IgE) with increased tendency to react against allergens present in the environment (pollen, cat, moulds, house dust, mite)
Sometimes, food allergies are more likely to be outgrown than inhalant allergies. Food allergy is much more common in children than in adults.
It is the oldest allergy test firstly performed by Dr Charles Blackley in Manchester, England. Standardised glycerinated extracts of various allergens are used which are highly accurate in its results to confirm which allergen is responsible. A diluted extract of each allergen is pricked into the skin of forearm or on the back. With a positive reaction, small raised, reddened area with surrounding flush (called wheal & flare) will appear at test site. The results are measured after 15-20 minutes. Skin Prick testing is done at Pulastya's CADLE under expert guidance of Dr Vivek Mehta.
It is the process of administering increasing amount of allergens by subcutaneous injections for which patient is found to be allergic. It eventually builds tolerance to these allergen substances and prevents them causing symptoms.
The exact mechanism by which immunotherapy switches off allergies is uncertain. It was hypothesized that the specific “IgE antibodies” were produced during successful immunotherapy.
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