Infectious Diseases

2. a situation involving exposure to danger.
4. the reason for which something is done or created or for which something exists.
8. (of a disease) spread from one person or organism to another by direct or indirect contact.
10. ubiquitous, mostly free-living organisms often consisting of one biological cell.
13. the process of incubating eggs, cells, bacteria, a disease, etc.
14. a disorder of structure or function in a human, animal, or plant, especially one that produces specific signs or symptoms
15. an infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria.

1. a group of single-celled eukaryotes, either free-living or parasitic, that feed on organic matter such as other microorganisms or organic tissues and debris.
3. (of a disease or disease-causing organism) likely to be transmitted to people, organisms, etc., through the environment.
5. any eukaryotic organism that is not an animal, plant, or fungus
6. a biological preparation that provides active acquired immunity to a particular infectious or malignant disease.
7. a state, period, or place of isolation in which people or animals that have arrived from elsewhere or been exposed to infectious or contagious
9. a bacterium, virus, or other microorganism that can cause disease a disorder of structure or function in a human, animal, or plant, especially one that produces specific signs or symptoms or that affects a specific location and is not simply a direct result of physical injury.
11. any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds
12. (of a disease) prevalent over a whole country or the world.