Immunity

5. A type of white blood cell that surrounds and kills microorganisms, removes dead cells, and stimulates the action of other immune system cells.
9. A protein produced by the body's immune system when it detects harmful substances, called antigens.
10. When germs like bacteria and fungi develop the ability to defeat the drugs designed to kill them.
11. Acquired from exposure to the disease organism through infection with the actual disease.
13. The act of introducing a vaccine into the body to produce protection from a specific disease.
15. Immune cells that target specific antigens.
17. Any substance that inhibits the growth and replication of a bacterium or kills it outright.
20. These white blood cells, called phagocytes engulf and destroy bacteria.

1. Part of the immune system, participating in both the innate and humoral immune responses.
2. A means by which the body is given immunity to a disease by intentional exposure to small quantities of it.
3. Cells that circulate in your blood that are part of the immune system.
4. A type of immune cell that can surround and kill microorganisms, ingest foreign material, and remove dead cells.
6. A type of immunity that occurs when a person is given antibodies rather than making them through his or her own immune system.
7. Results when exposure to a disease organism triggers the immune system to produce antibodies to that disease.
8. A type of white blood cell.
12. An infectious microbe consisting of a segment of nucleic acid (either DNA or RNA) surrounded by a protein coat.
14. Any substance that causes the body to make an immune response against that substance.
16. The innate immune system.
18. A complex network of cells, tissues, organs, and the substances they make that helps the body fight infections and other diseases.
19. A type of white blood cell that makes antibodies.