| Vaccine |
| Body toxin |
| Reactive toxin |
| Disease fighter |
| Immunity trigger |
| Immune response cause |
| Immune system booster |
| Immune-system stimulus |
| Immunologist's concern |
| Immune system triggerer |
| Infection-curbing agent |
| Immune response trigger |
| Immune response stimulus |
| Immune-response stimulator |
| Cause of an immune response |
| A or B in blood typing, e.g. |
| Substance used in immunology |
| It stimulates the immune system |
| It stimulates immune responses— tag nine (anag) |