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Disease
| Term | Definition |
|---|---|
| infection | invasion of the body by a pathogenic organism |
| disease | An abnormal state in which the body is not functioning normally |
| health | a state of complete physical, mental, and social well-being and not merely the absence of disease or infirmity |
| Pathogen | An organism that causes disease |
| non-infectious disease | a disease that cannot spread from one person to another |
| infectious disease | A disease that is caused by a pathogen and that can be spread from one individual to another |
| contagious | Able to be passed easily from one person to another |
| Microorganisms | organisms that are too small to be seen with the unaided eye |
| Bacteria | single-celled organisms that lack a nucleus; prokaryotes e.g. tuberculosis |
| Viruses | Viruses can only reproduce inside host cells, and they damage the cell when they do this. Smaller than bacteria e.g. influenza |
| Fungi | An organism that absorbs nutrients from the environment. e.g. athletes foot |
| Protozoans | Eukaryotic, single-celled; they move in a variety of means including flagella, cilia, and amoeboid motion. e.g. amoebic dysentery |
| parasitic worms | the largest of the pathogens, most of which are more a nuisance than they are a threat e.g. tape worm |
| Prions | A French chemist, this man discovered that heat could kill bacteria that otherwise spoiled liquids including milk, wine, and beer. |
| Germ Theory | the theory that infectious diseases are caused by certain microbes |
| Epidemics | Occurrences of diseases in which many people in the same place at the same time are affected |
| Pandemic | Disease that occurs over a wide geographic area and affects a very high proportion of the population. |
| Epidemiology | Branch of medical science concerned with the incidence, distribution, and control of diseases that affect large numbers of people. |
| plague | a disease that spreads quickly and kills many people |
| Black Death | Caused by bacteria yersinia pestis. killed an estimated 5 million people |
| Smallpox | The overall deadliest known disease in the history of the world. In the 20th century alone there were approximately 500,000,000 people who died of this disease. Caused by airborne variola virus |
| Influenza | caused by a virus and the current estimate is that it has killed 50 - 100 million |
Created by:
justineforrest
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