Across
- 4. The body's ability to prevent the invasion of pathogens
- 5. Disease-causing organism
- 7. Microscopic organism
- 8. A preparation that is used to stimulate the body's immune system
Down
- 1. An antigen that can cause an allergic reaction
- 2. A protein that can protect the body from pathogens
- 3. An illness having specific symptoms in the body
- 6. A protein capable of stimulating an immune response