Differentiate between active immunity and passive immunity.
| Active immunity | Passive immunity |
| It is produced due to contact with pathogen or antigen. | It is produced due to antibodies obtained directly. |
| It lasts for a long time. | It lasts for few days. |
| Antibodies are produced by the body against the antigen. | Antibodies are obtained from other sources. |
| Immunity is not immediate. There is a time lapse for the development. | Immunity develops immediately. |
| There are no or little side effects. | The introduction of antisera can cause serum sickness. |
| The person is exposed to the agent. | The person is not exposed to the agent but is given the antibodies. |