| A | B |
|---|
| infection | pathogenic microorganisms penetrate host defenses |
| infectious disease | infection progresses to cause damage or disrupt tissues or organs |
| etiologic agent | cause of an infectious disease |
| pathogenesis | development of disease |
| normal flora | microorganisms that live within host without causing disease |
| pathogen | organism that is parasitic and causes disease |
| opportunistic pathogen | cause disease in immunocompromised host |
| virulence | degree of pathogenicity |
| exogenous | source of infection comes from outside of the body |
| endogenous | source of infection comes from inside the body |
| adhesion | binding between specific molecules on host and pathogen |
| phagocytosis | immune defense cells engulf foreign bodies |
| -itis | inflammation |
| -emia | blood or associated with blood |
| -osis | disease or morbid process |
| -oma | tumor |
| necrosis | death of cells |
| acute infection | severe but short lived |
| chronic infection | persists over a long period of time |
| sign | objective evidence of disease as noted by observer |
| symptom | subjective evidence of disease as sensed by patient |
| leukocytosis | increase of white blood cells |
| leukopenia | decrease in white blood cells |
| septicemia | blood infection |
| bacteremia | bacteria in the blood |
| viremia | viruses in the blood |
| asymptomatic | no symptoms observed but patient is infected |
| latency | period of dormancy; organism is inactive |
| sequelae | long-term or permanent damage to tissues or organs |
| biological vector | infected insect that carries infectious disease |
| mechanical vector | insect that carries infectious disease but is not infected |
