Active Immunity (Cambridge (CIE) O Level Biology) : Revision Note

Active Immunity

Extended Tier Only

• Making antibodies and developing memory cells for future response to infection is known as active immunity

• There are two ways in which this active immune response happens:

  • The body has become infected with a pathogen and so the lymphocytes go through the process of making antibodies specific to that pathogen

  • Vaccination

• Active immunity is slow acting and provides long-lasting immunity