Summary of types of specific immunity
|Type of specific immunity||Example of how immunity might be acquired|
|Naturally acquired immunity||Active||Infection|
|Passive||Maternal antibodies crossing the placenta, or in breastmilk|
|Artificially acquired immunity||Active||Intentional exposure to antigens in a vaccine|
|Passive||Injection or transfusion of someone else’s antibodies|
You give a polio vaccination containing polio antigens to a baby girl. What type of immunity will the child develop? Explain your answer.
The child will develop artificially acquired active immunity. She was deliberately exposed to polio antigens in the vaccine, so her immunity is artificially acquired. She produced her own antibodies and memory cells directed against the polio antigens, so her immunity is active.