Infectious Diseases

3. bacteria, viruses, fungi, other microorganisms and their associated toxins.
5. the short-term immunity which results from the introduction of antibodies from another person or animal.
8. the process of infecting or the state of being infected.
11. treatment with a vaccine to produce immunity to a particular infectious disease or pathogen.
15. a member of a large group of unicellular microorganisms which have cell walls but lack organelles and an organized nucleus, including some that can cause disease.
18. a widespread occurrence of an infectious disease over a whole country or the world at a particular time.
19. the immunity which results from the production of antibodies by the immune system in response to the presence of an antigen.

1. the action or process of transmitting something, or the state of being transmitted.
2. a submicroscopic infectious agent that replicates only inside the living cells of an organism.
4. a large natural or artificial lake used as a source of water supply.
6. the ability of the immune system to respond more rapidly and effectively to pathogens that have been encountered previously,
7. a type of white blood cell called lymphocytes.
9. the science of protecting and improving the health of people and their communities.
10. the first response of the body's immune system to a harmful foreign substance.
12. A type of immunity that develops when a person's immune system responds to a foreign substance or microorganism, such as after an infection or vaccination.
13. 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.
14. a type of white blood cell that makes infection-fighting proteins called antibodies.
16. a widespread occurrence of an infectious disease in a community at a particular time.
17. an organism that transmits a pathogen, disease, or parasite from one animal or plant to another.