Abstract
An allergy is a hypersensitivity disorder of the immune system and an environmental disease, which occurs due to interaction between host & environmental (natural & human origin) factors. Over the last few decades, allergic diseases have increased worldwide. An association has been found with just about everything - poverty , global warming, pollution, new airtight houses, obesity , use of antibiotics, race , intestinal flora, family size, daycare centers, intestinal parasites. The existence of urban allergy syndrome as a distinct, clinically relevant entity now needs to be established. As it has a great impact on the person's quality of life, it is of utmost importance to understand the mechanism, the role of environmental modulation and the optimal modalities available for its treatment.
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