Active immunity

Definition

Active immunity is the protection against a disease through the production of antibodies by the immune system. This can occur naturally through infection or artificially via vaccination.

5 Must Know Facts For Your Next Test

1. Active immunity results in long-lasting protection due to memory cells.
2. Vaccines are a common method for inducing active immunity without causing disease.
3. It involves both humoral and cell-mediated immune responses.
4. Natural active immunity occurs when a person is exposed to a live pathogen and develops a primary immune response.
5. Artificial active immunity typically requires booster shots to maintain immunity over time.

Review Questions

• What are the two main ways active immunity can be acquired?
• Why do vaccines induce active immunity without causing actual disease?
• How does active immunity provide long-term protection?

Related terms

Passive Immunity:

Protection against disease through transferred antibodies, providing temporary immunity.

Memory Cells: Long-lived immune cells that remember past pathogens and provide faster responses upon re-exposure.

Booster Shot: An additional dose of a vaccine needed periodically to 'boost' the immune system.