Across
- 3. A substance that triggers an immune response.
- 7. Poisonous substances produced by organisms.
- 8. A disease that can be spread from person to person.
- 9. A disease outbreak affecting a whole country or the world.
Down
- 1. The body’s ability to resist disease.
- 2. A protein produced to fight a specific antigen.
- 4. A sudden outbreak of a disease affecting many people.
- 5. A microorganism that causes disease.
- 6. A substance that helps the body develop immunity.
- 10. System, The body’s defense system against disease.