The risk of an allergic reaction is dependent on either host or
environmental factors. An allergy is dependent on its host when the person is
genetically predisposed for that allergy, either through inherited disease or
congenital deficiency. An environmentally-dependent allergy is triggered when
the person comes in contact with an infectious disease, an airborne allergen,
pollution, or if they change their diet.
Genetic Causes
A parent with an allergy
is more likely to pass it to their child, and the child's allergy is also
likely to be more severe. Identical twins will share the same allergy 70% of
the time.
Environmental
Causes
A person is more likely
to suffer from an allergy if they live in a highly industrialized country, such
as factory-heavy regions. On the national level, allergies are more common in
an individual that lives in an urban area as opposed to a rural area.
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