Immune System

1. treatment with a vaccine to produce immunity to a particular infectious disease or pathogen.
3. A complex network of cells, tissues, organs, and the substances they make that helps the body fight infections and other diseases.
12. the antibody protection your body creates against a germ once you've been infected with it.
14. an infective agent that typically consists of a nucleic acid molecule in a protein coat, is too small to be seen.
15. a method by which a virus can replicate its DNA using a host cell.
16. a large phagocytic cell found in stationary form in the tissues or as a mobile white blood cell, especially at sites of infection.
17. A type of white blood cell that makes antibodies.
18. A type of white blood cell.
19. a medicine (such as penicillin or its derivatives) that inhibits the growth of or destroys microorganisms.
20. provided when a person is given antibodies to a disease rather than producing them through his or her own immune system.

2. when germs like bacteria and fungi develop the ability to defeat the drugs designed to kill them.
4. results when exposure to a disease organism triggers the immune system to produce antibodies to that disease.
5. by which the body is given immunity to a disease by intentional exposure to small quantities of it.
6. a type of cell within the body capable of engulfing and absorbing bacteria and other small cells and particles.
7. A type of blood cell that is made in the bone marrow and found in the blood and lymph tissue.
8. a blood protein produced in response to and counteracting a specific antigen.
9. A cell that is part of the immune system and helps the body fight infections and other diseases.
10. a toxin or other foreign substance which induces an immune response in the body, especially the production of antibodies.
11. a form of small leukocyte (white blood cell) with a single round nucleus, occurring especially in the lymphatic system.
13. when a virus has infected a cell, replicated new virus particles, and bursts.