Types of adaptive immunity

•Active– reaction of your

own system

•Passive– borrow immune agents from another

person

WBC

Pathogen

Antibodies

Types of adaptive immunity

•Natural – occurs accidentally, on its own –Active – you are exposed to the

flu, then develop immunity to that flu strain

–Passive – a fetus receives antibodies from mom

•Artificial – stimulated on purpose–Active – vaccination with a killed

virus triggers immunity to the live virus

–Passive – Injection of antibodies provides immunity

Inappropriate immunity

• Autoimmunity – “self” cells are attacked (abnormal)

• Allergy (Hyperimmunity) – excessive response to antigen, or response to something not normally an antigen (allergen)