Across
- 4. A protein produced by white blood cells into the bloodstream in response to antigens.
- 6. A disease that cannot be transmitted from one individual to another.
- 9. Pathogens enter the body through the ___________ system, digestive system, excretory system and skin.
- 10. an effort to stimulate the body defence against infections in babies, children and adults by injecting vaccines.
Down
- 1. A disease that can be transmitted from one individual to another.
- 2. Organisms that cause diseases.
- 3. A foreign substance that comes from outside the body and induces the production of antibodies.
- 5. Animals that transmit pathogens from one host to another host.
- 7. The body produces its own antibodies when stimulated by antigens
- 8. The body gains antibody from external sources