Across
- 2. an informal way to say vaccine
- 4. get an illness
- 8. someone who studies protection against disease
- 9. an extra amount of a vaccine
- 10. a type of the same virus
- 11. a hard dry layer that forms over a wound
- 12. a painful place on your body
Down
- 1. something that causes diseases
- 3. give someone an injection to protect them from a disease
- 5. related to breathing
- 6. a system of connected organs and tissues
- 7. a substance produced in the body to fight disease