Across
- 3. The body system that fights infection (2 words).
- 4. Cells that attack pathogens (3 words).
- 8. Something that causes disease.
- 9. Protection against a disease.
- 10. Keeping the body's internal conditions stable.
Down
- 1. An increase in body temperature during illness.
- 2. Protection for a community when many people are immune to a disease (2 words).
- 5. A treatment that helps protect against disease.
- 6. A pathogen that must live inside cells to reproduce.
- 7. Proteins that help the body fight pathogens.