Allergy – Mechanism, Symptoms, Risk factors, Diagnosis, Treatment and Prevention, Animation

Allergy – Mechanism, Symptoms, Risk factors, Diagnosis, Treatment and Prevention, Animation

Allergy refers to abnormal reactions of the immune system to otherwise harmless substances. Normally, the immune system raises immune response to protect the body from foreign invaders, such as bacteria or viruses, but does not react to non-infectious environmental antigens. In people with allergies, however, the immune system also reacts to these substances, producing allergic…