What is a cross allergy?
We're talking about cross-reactivity
when a person allergic to a substance reacts to substances of similar
composition or structure.
However, the existence of
cross-reactivity is not systematic
How is the diagnosis of cross
allergies?
Currently, molecular analyzes have
to clarify the diagnosis of cross allergies. During a cross-allergy in a
person, a skin test will be performed to identify the allergen responsible for
symptoms. The skin test may be supplemented by a blood test to highlight the
IgE immunoglobulins produced by the body and which are specific to the
allergen.
From the offending allergen, molecular
analyzes are performed to find the fragments of proteins responsible for the
allergy. These proteins will be sought in food extracts or other substances
having the same structure. Thus, the protein fragments contained in the
allergen responsible for allergic rhinitis to birch pollen are also identified
in some fruits like apple, cherry, strawberry, kiwi ...
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