Chapter 13

2. a tiny disease-causing particle that consists of genetic material and a protein coat.
5. a substance usually prepared from killed or weakened pathogens or from genetic material and that is introduced into a body to produce immunity.
7. a bacterial infection of the digestive system, usually spread by eating contaminated food.
9. infection caused by fungi.
11. an agent that causes disease.
12. an inflammation of the liver.
14. a reaction to injury or infection that is characterized by pain, redness, and swelling.

1. most often found in water and soil.
3. tiny, single-celled organisms, some of which can cause disease.
4. an inflammation of the membranes covering the brain and spinal cord.
6. a change that a person notices in his or her body or mind and that is caused by a disease or disorder.
8. extra doses of a vaccine that help the body maintain the production of memory cells for a particular disease.
10. caused by a protozoan that is passed from one person to another by mosquitos.
13. an organism that absorbs and uses nutrients of living or dead organisms.