Allergy

Статья. опублтикована в Wiley Online Library, 2005 Allergic diseases are defined as hypersensitivity reactions caused by the immune system reacting erroneously to external material to which it normally should not react. There are two types of allergic disease, of which the most common and complex are the atopic allergies such as asthma and hay fever. A smaller group of patients have contact dermatitis caused by delayed hypersensitivity reactions.