IMMUNOLOGY

Detailed explanation-1: -Allergic reactions (hypersensitivity reactions) are inappropriate responses of the immune system to a normally harmless substance. Usually, allergies cause sneezing, watery and itchy eyes, a runny nose, itchy skin, and rash. Some allergic reactions, called anaphylactic reactions.

Detailed explanation-2: -Some primary immunodeficiencies are more commonly associated with allergic issues. These include Hyper-IgE syndromes (HIES) and IPEX. Omenn’s Syndrome is caused by the same genetic mutations that lead to Severe Combined Immune Deficiency (SCID).

Detailed explanation-3: -Hypersensitivity reactions are exaggerated or inappropriate immunologic responses occurring in response to an antigen or allergen. Type I, II and III hypersensitivity reactions are known as immediate hypersensitivity reactions because they occur within 24 hours of exposure to the antigen or allergen.

Detailed explanation-4: -Allergic reactions (hypersensitivity reactions) are inappropriate responses of the immune system to a normally harmless substance. Usually, allergies cause sneezing, watery and itchy eyes, a runny nose, itchy skin, and rash. Some allergic reactions, called anaphylactic reactions.

Detailed explanation-5: -Asthma. The response in your lungs can cause coughing, wheezing, and trouble breathing. Eczema. An allergen causes an itchy rash known as atopic dermatitis. Allergic rhinitis.