Knowledge Center

What is Allergy?

Immune system overreaction
When a person with allergic constitution encounters an allergen, the allergic antibody in the body reacts with the allergen and releases histamine, which will cause inflammatory reaction and allergic symptoms
The most common allergic symptoms are itchy nose,itchy eyes, red skin, swollen throat, diarrhea, etc. For those allergic diseases include allergic rhinitis, asthma,ectopic dermatitis, etc.

Type I Immediate hypersensitivity

Small particles in contact with the outside world, ex. pollen or dust.Common diseases include asthma, hay fever, allergic rhinitis, ectopic dermatitis,and systemic allergic reaction.

Type II Antibody dependent cytotoxic hypersensitivity

Cellular antigen is the hemolytic phenomenon of rejection of differentblood groups in specific tissues or cellsafter blood transfusion. ex. Hemolytic anemia, drug reaction.

Type III Immune complex mediated hypersensitivity

Soluble antigen. Common diseases include rheumatoid arthritis, allergicpneumonia, serum disease, systemic lupus erythematosus, etc.

Type IV Delayed-type hypersensitivity

Soluble antigens and cellular antigens,such as microorganisms, proteins , plantsor drugs. Allergic reactions will not occurimmediately, but will occur after 48 ~ 72hours of skin contact with allergens.