Describe4 marksStandard
The table below summarises four types of immunity.
| Immunity type | How antibodies are obtained | Duration of immunity |
|---|---|---|
| Active natural | Produced by the person's own immune system after infection | Long-lasting (memory cells) |
| Passive natural | Received from mother via placenta or breast milk | Temporary (no memory cells) |
| Active artificial | Produced by the person's own immune system after vaccination | Long-lasting (memory cells) |
| Passive artificial | Injected as pre-formed antibodies from another organism | Temporary (no memory cells) |
Using the information in the table, describe the differences between active and passive immunity, and between natural and artificial immunity.