Across
- 4. the number of seconds you should wash your hands
- 5. thick, spongy jelly inside bones
- 8. organisms that are parasites on the body
- 9. the system that is home to germ-fighters
- 14. disease that usually attacks the liver
- 15. a virus spread by rodents
- 16. these cause infections
- 17. a disease that can get under toe nails
- 18. high blood sugar, an immune disease
Down
- 1. white blood cells
- 2. nodes that make up the lymphatic system
- 3. they help recognize and remember invaders
- 6. a type of arthritis
- 7. organ in your belly that helps fight germs
- 9. when immune system attacks healthy cells
- 10. to be free or resist illness
- 11. a disease that has no cure, you must endure it
- 12. chews up invading germs
- 13. a virus that can attack a human brain