Across
- 2. one celled organism bigger and more complex
- 5. resistance to a particular disease
- 7. one celled organism that lives almost everywhere
- 10. infection of liver, three types
- 13. fatigue, fever, swollen glands in neck
- 14. microscopic particles that reproduce in cells
Down
- 1. living organism that can cause disease
- 3. body system that destroys pathogens
- 4. dead or weakened pathogens given for immunity
- 6. bacteria often infecting lungs
- 8. a common childhood vaccine
- 9. protein that can find, weaken, destroy germs
- 11. fever, headache, muscle aches, runny nose,
- 12. living organisms that can't make their own food