Across
- 3. System that protects the body from disease
- 5. Protein produced by the immune system to fight pathogens
- 7. triggers antibody production
- 9. Common symptom of infection
- 11. Single-celled organisms that can cause illness
Down
- 1. Cell that helps defend the body against infection
- 2. Drug used to kill bacteria
- 4. Substance that stimulates immunity against a disease
- 6. General term for disease-causing organism
- 8. Condition caused by invasion of pathogens
- 10. Type of pathogen that causes diseases like flu