What are the 3 major types of epidemiologic studies?
Three major types of epidemiologic studies are cohort, case-control, and cross-sectional studies (study designs are discussed in more detail in IOM, 2000). A cohort, or longitudinal, study follows a defined group over time.
What is the aim of epidemiology?
The principal aim of epidemiology is to identify factors related to the occurrence of disease. Identification of these factors both causal ( causation) and risk factors, enable developing a rational basis for prevention ( epidemiology, prevention).
What is the epidemiological triangle?
The Epidemiologic Triangle, sometimes referred to as the Epidemiologic Triad, is a tool that scientists use for addressing the three components that contribute to the spread of disease: an external agent, a susceptible host and an environment that brings the agent and host together.
What is the best definition for the epidemiological triangle?
A number of models of disease causation have been proposed. Among the simplest of these is the epidemiologic triad or triangle, the traditional model for infectious disease. The triad consists of an external agent, a susceptible host, and an environment that brings the host and agent together.
What are the 3 main elements of the definition of epidemiology?
Epidemiology includes assessment of the distribution (including describing demographic characteristics of an affected population), determinants (including a study of possible risk factors), and the application to control health problems (such as closing a restaurant).
What are the applications of epidemiology?
The epidemiological method is the only way of asking some questions in medicine, one way of asking others, and no way at all to ask many. Several uses of epidemiology have been described: 1. To study the history of the health of populations, and of the rise and fall of diseases and changes in their character.
What are the two categories of epidemiological study?
Epidemiologic studies fall into two categories: experimental and observational.
Which of the following is an example of epidemiological transition?
In demography and medical geography, epidemiological transition is a theory which “describes changing population patterns in terms of fertility, life expectancy, mortality, and leading causes of death.” For example, a phase of development marked by a sudden increase in population growth rates brought by improved food …
Do Epidemiological studies show cause and effect?
A principal aim of epidemiology is to assess the cause of disease. However, since most epidemiological studies are by nature observational rather than experimental, a number of possible explanations for an observed association need to be considered before we can infer a cause-effect relationship exists.
What are the two most common types of epidemiological studies used to investigate the source of an outbreak?
Case control and cohort studies are the two most frequently used epidemiological study designs in a foodborne outbreak investigations.
How do you identify an outbreak?
Outbreaks are detected by using public health surveillance methods, including PulseNet, formal reports of illnesses, and informal reports of illnesses.
How do you confirm an outbreak?
An epidemic can be confirmed by comparing the incidence of the disease with that in the recent past or at a similar time in previous years for the same community. Alternatively, an outbreak may be confirmed if a number of cases are clustered and come from the same place at a similar time.
How do you identify an epidemic?
Generally, an epidemic occurs when host immunity to either an established pathogen or newly emerging novel pathogen is suddenly reduced below that found in the endemic equilibrium and the transmission threshold is exceeded.
How do you control an outbreak?
What are outbreak control measures?
- Cleaning and disinfecting food facilities.
- Temporarily closing a restaurant or processing plant.
- Recalling food items.
- Telling the public how to make the food safe (such as cooking to a certain temperature) or to avoid it completely.