Introduction to Epidemiology Flashcards
;Study of the distribution and determinants of health-related states among specified populations and the application of that study to the control of health problems.
Epidemiology
Epi means?
upon
Demos means?
people
Logos means?
study of
Descriptive epidemiology.
Distribution
Distribution of frequencies and patterns of health events (person, place, time) [Who, where, when] within groups in a population.
Distribution
A branch of epidemiology that is about the causes; root cause; how and whys].
Search for causes or factors that are associated with increased risk or probability of disease “who” “what” “where” “when” “how” and “why”.
Determinants
Infectious diseases, chronic disease, environmental problems, behavioral problems, and injuries.
Health-related states
Groups of people rather than with individual patients.
Population
Control the numbers.
Population
Clinical medicine: signs and symptoms [getting the data from a specific person].
Population
signs and symptoms [getting the data from a
specific person].
Clinical medicine
In epidemiology, we are describing the situation and know the who, when, where, hows, and whys.
Clinical medicines
Applied or field epidemiology.
Control
Epidemiologic data results to public health decision making and aids in developing and evaluating interventions to control and prevent health problems.
Control
[4] Steps in Solving Health Problems
- Data collection
- Assessment
- Hypothesis testing
- Action
Surveillance; determine time, place, and person.
[steps in solving health prob]
Data collection
Interference
[steps in solving health prob]
Assessment
Determine how and why.
[steps in solving health prob]
Hypothesis testing
Intervention
[steps in solving health prob]
Action
[3] Theories of Disease Causation
- Germ or Bacteriology Theory
- Filth theory
- Bad air
Associates disease with the physical environment.
[theories of disease causation]
Filth theory
Disease change with seasons, climate, temperature, overcrowding and filth.
[theories of disease causation]
Filth theory
Diseases were due to poisonous substances and gases from the earth.
[theories of disease causation]
Filth theory
was the cause of fever.
[theories of disease causation]
Bad air
Building huge fires can purify the air.
[theories of disease causation]
Bad air
Programs to remove filth likewise put up to serve to advance community sanitation.
[theories of disease causation]
Bad air
Koch confirmed Pasteur’s previous claims.
[theories of disease causation]
Germ or Bacteriology Theory
Disease is due to microscopic forms of life.
[theories of disease causation]
Germ or Bacteriology Theory
Opened the concepts of isolation and quarantine.
[theories of disease causation]
Germ of Bacteriology Theory
Measures to destroy and remove the bacteriological cause such as disinfection , fumigation and general cleanliness.
[theories of disease causation]
Germ of Bacteriology Theory
Explained the origins and spread of communicable disease.
[theories of disease causation]
Bacteriology
States that effects never depend on single isolated causes but rather develop as the result of chains of causation → result of complex genealogy and antecedents.
The web
The host and agent are at the opposite ends of a hypothetical lever while the environment serves as the fulcrum.
Epidemiologic Lever
External to the host and in which the agent
may exist, survive, or originate.
The environment
physical, climatologic, biologic, social and
economic.
The environment
water, humidity, geologic formations, etc.
[environment]
Physical
characteristics of a group of people.
[environment]
Social
enhance or diminish survival of agent.
Environment
serve to bring agent and host into contact.
Environment
reservoir that fosters the survival of infectious disease agent.
Environment
Living organism or inanimate matter in which an infectious agent normally lives and multiplies on which the agent depends primarily for survival and reproduces itself in
such manner that it can be transmitted to a susceptible host.
Reservoir
[3] Reservoir of infection
- Physical environment
- Animals or insects
- Human beings (main reservoirs)
(+) infection and (+) disease
Cases
(+) infection and (-) disease
Carriers
Infectious diseases of animals that can cause disease when transmitted to humans.
Zoonotic disease
[2] ex of Zoonotic Disease
rabies
plague
It is any element, substance, or force whether living or non-living, the presence or absence of which can initiate or perpetuate a disease process.
Agent
[2] types of agent.
- Non-living
- Living
[3] Non-living agents
- Physical and mechanical
- Chemicals
- Nutrients
Extremes of temperature, light, electricity, physical trauma.
[non-living]
Physical and Mechanical
Exogenous and Endogenous
[non-living]
Chemical
poisons.
Exogenous
accumulation of toxic products of metabolism.
Endogenous
Deficiency and Excess agents
[non-living]
Nutrients
anemia from iron deficiency.
[nutrients]
Deficiency agents
obesity from over-eating.
[nutrients]
Excess agents
Biological organism capable of causing
disease.
Living agents
He state that four postulates should be met before a causal relationship can be accepted between a particular bacterial parasite (or disease agent) and the disease in question.
Henle Koch 1877, 1882
The agent must be shown to be present in every case of the disease by isolation in pure culture.
Henle Koch Postulate
The agent must NOT be found in cases of other disease.
Henle Koch Postulate
Once isolated, the agent must be capable of reproducing the disease in experimental animals.
Henle Koch Postulate
Once isolated, the agent must be capable of reproducing the disease in experimental animals.
Henle Koch Postulate
The agent must be recovered from the experimental disease produced.
Henle Koch Postulate
Disease results from an imbalance between disease agent and man.
Epidemiologic Lever
[5] Types of Living Agents
- Bacteria
- Viruses
- Fungi
- Protozoans
- Helminthes
[2] Pathogenicity
- High pathogenicity
- Low pathogenicity
Bacillus anthracis
[pathogenicity]
High pathogenicity
Candida albicans
[pathogenicity]
Low pathogenicity
Nonliving intermediates that act as the agents of transmission by indirect contact are referred to as?
Fomites