Abstract
Allergic diseases have different frequencies. In particular, allergic rhinitis and asthma have high frequencies of about 20% and 10%, respectively. Other allergic diseases have lower frequencies; for example, food allergy has a frequency of 1%-4%. There are also rare allergic diseases, with a prevalence of 5 cases per 10000 people in the general population, and they are included in Orphanet. However, other extremely rare allergic diseases still need to be properly known in order to be possibly recognized as rare diseases and cataloged in Orphanet.
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