| A | B |
|---|
| Infection | Invasion of colonization of the body by pathogenic microbes |
| Disease | A change from the state of health--may or may not involve microbes |
| Normal microbiota (flora) | Population of microbes that are considered normal inhabitants of the body; do not produce disease under normal conditions |
| Opportunistic pathogens | Organisms that usually do not cause disease, but under abnormal conditions or in abnormal locations they may do so |
| Symptoms | Changes caused by a disease; not apparent to an observer |
| Signs | Changes caused by a disease; can be observed or measured |
| Sporadic disease | Occurs only occasionally |
| Endemic disease | Always present in a population |
| Epidemic | Many people come down with the disease in a short period of time |
| Pandemic | Worldwide epidemic |
| Systemic infection | Microbes spread throughout body |
| Bacteremia | Bacteria present in blood |
| Septicemia | Bacteria present AND MULTIPLYING in the blood |
| Toxemia | Toxins in blood |
| Zoonosis | Disease that spreads from animals to humans |
| Vector | Animal that carries pathogen from one host to another |
| Mechanical vector | Physical transmission (fly walks on cow patty and then on your potato salad) |
| Biological vector | Pathogen must undergo developmental stage within the vector |
| Morbidity | Number of people affected with the disease |
| Mortality | Number of deaths |
