Finals Flashcards
The study of disease, but they involve different aspects of disease.
EPIDEMIOLOGY
Studies the factors that determine the frequency, distribution and determinants of diseases in human populations.
Epidemiologist
British physician, designed and conducted an epidemiologic investigation of a cholera outbreak in London
John Snow
The infectious disease is transmissible from one human to another (person to person)
Communicable disease
A communicable disease that is easily transmitted from one person to another.
Contagious Disease
The human acquires from animal sources
Zoonotic disease (zoonosis)
The number of new cases of that disease in a defined population during a specific time period
Incidence
Expressed as a number of new cases of a particular disease that occurred during a specified time period per a specifically defined population. (usually per 1000, 10,000 or 100,000 population)
Morbidity Rate
Prevalence is the proportion of a population who have a specific characteristic in a given time period.
Prevalence
Two types of Prevalence
- Period Prevalence
2. Point Prevalence
The number of cases of the disease existing in a given population during a specific time period
PERIOD PREVALENCE
The number of cases of the disease existing in a given population at a particular moment in time
Point prevalence
Refers to death
Also, known as death rate
MORTALITY RATE
The ratio of the number of people who died of a particular disease during a specified time period per a specified population
MORTALITY RATE
Occurs only occasionally within the population of a particular geographic area
Sporadic Disease
It is always present within the population of a particular geographic area
The number of cases of disease may fluctuate overtime but the disease never dies out completely.
refers to the constant presence and/or usual prevalence of a disease or infectious agent in a
population within a geographic area.
Endemic Disease
Greater than usual number of cases of disease in particular region usually occurring within a relatively short period of time
Refers to an increase, often sudden, in the number of cases of a disease above what is normally expected in that population in that area
Epidemic Disease (outbreak)
infectious disease occurs depends on many factors,
- FACTORS PERTAINING TO THE PATHOGEN
- FACTORS PERTAINING TO THE HOST
- FACTORS PERTAINING TO THE ENVIRONMENT
FACTORS PERTAINING TO THE PATHOGEN
Virulence of pathogens
Way for pathogen to enter the body
Number of organism that enter the body
FACTORS PERTAINING TO THE HOST
Health status
Nutritional status
Other factors pertaining to the susceptibility of the host
FACTORS PERTAINING TO THE ENVIRONMENT
Physical factors su8ch as geographical location, climate, heat cold humidity and season of the year.
Availability of appropriate reservoir
Sanitary and housing condition, adequate waste disposal
Any site where the pathogen can multiply or merely survive until it is transferred to a host.
RESERVOIR OF INFECTION (reservoir)
Includes human, household pets, farm animals, wild animals, certain insects, and certain arachnids (ticks or mites)
LIVING RESERVOIRS
Most important reservoir of human infectious disease is other human- people with infectious diseases as well as carriers.
Human Carriers
A person who is colonized with a particular pathogen.
CARRIER
SEVERAL TYPES OF CARRIER
- Passive carrier
- Incubatory carrier
- Convalescent carrier
- Active carrier
Carry the pathogen without ever having had the disease.
Passive carrier
A person who is capable of transmitting a pathogen during incubation period of particular infectious disease.
Incubatory carrier
Harbor and can transmitted a particular pathogen while recovering from an infectious disease
Convalescent carrier
Have completely recovered from the disease, but continue to harbor the pathogen indefinitely
Active carrier
Caused by Toxoplasmosis gondii, can be contracted by ingesting oocytes from cat feces that are present in litter boxes or sand boxes as well as ingesting cysts that are present in infected raw or undercooked meats.
Toxoplasmosis
May cause brain damage or death
Toxoplasmosis
Serve as reservoir of infections including insects and arachnids
Arthropods
These arthropods are referred to as
VECTORS