Across
- 3. Small chemicals released by white blood cells
- 4. Smallest type of pathogen
- 6. A very small living thing
- 9. A chemical found on the surface of an organism
- 11. Medicine that kills bacteria but not viruses
- 12. Surname of the scientist who developed the first vaccine
Down
- 1. A type of white blood cell that produce antibodies
- 2. Causes athlete's foot
- 5. Types of pathogen bigger than a virus
- 7. A disease spread by mosquitoes
- 8. These contain dead or weakened microorganisms
- 10. When a phagocyte completely surrounds a microbe