Infectious Diseases

4. tiny, single-celled living organisms
6. a cavity or part that holds some fluid or secretion
7. I'm the only girl in my physics class
8. a disease outbreak rapidly spreading in a limited region
12. the action of structures and substances that are naturally present
15. a microorganism capable of causing death or disease on a living organism
16. the reaction of the cells and fluids of the body to the presence of a substance which is not recognized as a constituent of the body itself
17. the branch of medicine which deals with the incidence, distribution, and possible control of diseases and other factors relating to health
18. the action of transmitting something
19. the severity or harmfulness of a disease
20. treatment to produce immunity to a particular disease

1. estimated number of newly infected during a specific time frame
2. charged with fighting off bacterias, viruses and cancers
3. an infectious agent
5. the number of people in a population who currently have the disease
9. an epidemic spreading to multiple regions across the globe
10. a disease that can be transmitted from animals to humans
11. something used as a vehicle to carry infectious pathogens
13. refers to immunity that occurs in response to exposure to a particular antigen
14. attack and kill infected cells in the body