Across
- 3. an agent that causes disease
- 5. the third line of defense
- 7. a substance that triggers the production of antibodies
- 8. the second line of defense
- 9. a type of white blood cell that produces antibodies in response to a pathogen
- 10. a small microbe that attaches to good immune system cells and creates copies of itself
Down
- 1. a small microbe that can be good or bad
- 2. a protein that responds to a specific antigen
- 4. a process where cells ingest or engulf other cells or particles
- 5. the first line of defense
- 6. solution containing a harmless version of a virus, bacterium or toxin that causes an immune response to build immunity