1. Infectious Diseases

2. 1. bacteria, virus

3. 2. virus, bacteria

4. 3. fungus, virus

5. 4. protozoan, virus

6. 5. parasite, fungus

7. p. 316 6.An______________is any disease that is caused by an agent that has invaded the body. 7._________any agent that causes disease. 8._________tiny single-celled organisms, some of which can cause disease. 9.___________a tiny disease-causing particle that consists of genetic material and a protein coat.

8. 10.____________a condition in which bacteria can no longer be killed by a particular antibiotic.

9. p. 322 11. ____________a reaction to injury or infection that is characterized by pain, redness, and swelling. 12.__________a change that a person notices in his or her body or mind and that is caused by a disease or disorder. 13.____________a network of vessels that carry a clear fluid called lymph through the body.

10. p.322 14.__________a substance usually prepared from killed or weakened pathogens or from genetic material and that is introduced into a body to produce immunity. 15. ____________a blood cell whose primary job is to defend the body against disease.

11. 16. Person to person, environment

12. 17. environment, person to person

13. 18. Food and water, animals

14. 19. animals, person to person