Chemistry

3. Slightly ill
9. A vaccine that uses engineered DNA to induce an immunologic response in the host against bacteria, parasites, viruses, and potentially cancer.
11. The act of forbidding something.
12. Spread from one person or organism to another by direct or indirect contact
14. Of the nature of, caused by, or relating to a virus or viruses
15. A sickness characterized by specific signs or symptoms
17. A substance used to stimulate immunity to a particular infectious disease or pathogen
19. A toxin or other foreign substance which induces an immune response in the body, especially the production of antibodies.
20. A physical or mental feature which is regarded as indicating a condition of disease
21. A large group of single-cell microorganisms. Some cause infections and disease in animals and humans.

1. An English physician and scientist who pioneered the world's first vaccine
2. More likely to get a disease than other people, animals, or plants
4. Random or without reason.
5. Inflammation of the brain.
6. A bacterium, virus, or other microorganism that can cause disease.
7. Immunize someone against a disease by introducing infective material
8. To inoculate with the smallpox virus
10. similar or like.
13. An infectious viral disease causing fever and a red rash on the skin.
16. Necessary or important.
18. A complex network of cells, tissues, organs, and the substances they make that help the body fight infections and other diseases