Across
- 5. spread to everyone
- 7. bacteria
- 10. bacteria to make you sick
- 11. time period
- 12. 100 years
Down
- 1. a way of doing thing
- 2. sickness illness
- 3. injection to prevent disease
- 4. system -fight / protect
- 6. hard difficult
- 8. teat
- 9. idea to proven