Across
- 5. spread by direct or indirect contact with sick person
- 6. short for influenza
- 7. the first flu vaccine was developed for these people
- 9. created by immune system to stop infection
- 10. medicine to help you breathe easier
- 12. this causes your body to produce antibodies to protect you
Down
- 1. instrument needed to see a virus
- 2. tiny organism that can only reproduce inside a cell
- 3. like the flu but not as severe
- 4. change into something different
- 8. signs of an illness
- 11. their immune system is not fully developed