Across
- 2. weak form of a virus given to protect you from the virus
- 5. help develop
- 7. extremely important
- 9. small creatures seen only with a microscope
- 11. adjust
- 12. came into contact
Down
- 1. number of cases
- 3. carried
- 4. tension
- 6. fight off
- 8. passed by touch through the air
- 10. get better