Across
- 4. - they fight pathogens that have entered the body.
- 6. - weak version of a pathogen introduced into an organism
- 8. - living organisms that cause disease in others.
- 9. - a virus that causes flu.
- 10. body's ability to resist disease
- 11. caused by HIV.
- 12. - immunity acquired when we take medicine during sickness.
Down
- 1. - an organism that is invaded by a pathogen
- 2. - babies get this kind of immunity through breast milk.
- 3. - well being
- 5. treatment for bacterial infections.
- 7. - physical barrier in air passages to prevent pathogens and duct from reaching the lungs.