Across
- 4. virus which has caused the most recent pandemic
- 6. the body's ability to protect itself against a disease
- 7. large part of a population is immune to a disease
Down
- 1. a reaction by the body to a disease
- 2. a disease causing organism
- 3. a substance used to stimulate the production of antibodies that provide immunity against a disease
- 5. protected against a disease