Diseases

2. Tiny one-celled organisms that live nearly everywhere
4. A strict isolation imposed to prevent the spread of disease
8. the period between exposure to an infection and the appearance of the first symptoms
9. Primitive life-forms, such as molds or yeasts, that cannot make their own food
11. one-celled organisms that have a more complex structure than bacteria
12. Any substance that provides active acquired immunity to a particular disease
15. A microorganism that causes disease'
17. An outbreak of disease that spreads quickly and affects many people in an area
19. The smallest and simplest disease-causing organisms
20. a disease that can be spread through close contact

1. a disease occurs in greater numbers than expected in a community or region or during a season
3. the ability of microbes to grow in the presence of a chemical (drug) that would normally kill them or limit their growth
5. A disease that can be spread to a person from another person, an animal, or an object
6. An organism that transmits pathogens from one host to another
7. An organism that has a pathogen and can spread it but does not show any symptoms
10. An organism on WHICH a parasite lives
13. an organism that lives in or on another organism; one who lives off another person
14. A disease that spreads over a large area or throughout the world
16. Organisms that are so small they can only be seen through a microscope
18. Ability of an organism to resist a particular infection