| Parameters | Active Immunity | Passive Immunity |
|---|
| Duration of its protection | Active immunity is generally long-lasting, as it is created by the host’s antibodies in response to direct antigen interaction. | Passive immunity is only effective for a few weeks or months at most. It is caused by the introduction of antibodies into the host from the outside. |
| Immunological Memory | It results in the formation of immunological memory. | It has no effect on immunological memory. |
| Time of its Response | Immunity does not develop overnight. | Immunity develops almost instantly. |
| Side Effects | There aren’t any negative consequences. | It has the potential to trigger responses. |
| Production of Antibodies | Antibodies and other specialized lymphocytes are generated when antigens enter the body. | Antibodies are brought in from a different source. Antibodies are introduced to a foetus through the placenta and to a newborn through the mother’s milk. |