Adverse immune reactions are inappropriate or harmful responses of the immune system triggered by certain chemicals or toxins. These reactions can be classified into different categories, including hypersensitivity reactions, autoimmunity, and immunosuppression. Hypersensitivity reactions are exaggerated responses to an antigen, leading to allergies or anaphylaxis. Autoimmunity occurs when the immune system mistakenly attacks the body's own cells. Immunosuppression involves the reduction in the efficacy of the immune response, leaving the body more vulnerable to infections.
