Related Clues:
- Sabin development
- Cause of an immune response
- Medical breakthrough
- It stimulates the immune system
- Flu forestaller
- Immunity trigger
- Immunologist's concern
- A or B in blood typing, e.g.
- Big shot?
- Salk discovery
- Immunity provider
- Immune response trigger
- H1N1 defense
- Shot, perhaps
- Vice can create protection against disease