Flashcards in Chapter 14 Principles of Disease and Epidemiology Deck (36):
Study of disease
Study of the CAUSE of a disease
Colonization of the body by pathogens
An abnormal state in which the body is not functioning normally
animal or human that harbors pathogen. Provides nutrients for pathogen.
Lives off of a host. Cause damage to body.
A microorganism that causes disease and death.
How does normal flora help.
-Occupying niches that pathogens might occupy.
To live together. The relationship with the normal flora and the host,
Relationship that only one benefits. Example?
Both host and microorganism benefit. Example?
Only parasite benefits.
Disease caused by infections of parthogenic microorganisms
Germ Theory of Disease
Used to prove the cause of an infectious disease.
Koch's Postulates. (Experiment)
Subjective characteristics of disease felt by the patient.
Objective manifestations of diease that can be observed by others.
Symptoms + Signs
Number of new cases of a disease in a given area during a given period of time
Number of total cases of a disease in a given area during a given period of time
Diease occurs at stable frequency in given population.
Few cases occur with in area
Number cases observed exceeds the number of expected
Epidemics occurring simultaneously in contienents
Period of no signs or symptoms
Milds signs or symptoms. Period from incubation period till you start showing s/s.
Most severe s/s
Period of illness
s/s still present. Microorganisms subsiding.
Period of decline
No s/s present. Microorganisms dying off. Still contagious.
Period of convalescence
In order to cause a disease what must happen?
Microorganisms must maintain a reservoir, leave reservoir and gain access to new host, colonize and harm the body. Most pathogens cannot survive long outside of a host.
Disease caused by animals.
How is zoonoses caused?
-Direct contact with animal or its waste.
Infected individuals who are asymptomatic but infective to others.
Give example of nonliving reservoirs. (3)
Hospital acquired infection.