What is the epidemiologic triad of a disease?
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?
The epidemiologic triangle is made up of three parts: agent, host and environment.
What are the 3 divisions of epidemiology?
The three major epidemiologic techniques are descriptive, analytic, and experimental. Although all three can be used in investigating the occurrence of disease, the method used most is descriptive epidemiology.
What are the 3 factors that cause disease?
Infectious diseases can be caused by:
- Bacteria. These one-cell organisms are responsible for illnesses such as strep throat, urinary tract infections and tuberculosis.
- Viruses. Even smaller than bacteria, viruses cause a multitude of diseases ranging from the common cold to AIDS.
- Fungi.
- Parasites.
What are the 3 modes of transmission?
Modes of transmission
- Direct contact.
- Droplet spread.
What is a vector in epidemiology triad?
The epidemiologic triad (epi-triad) classically consists of agent, host, and environment. However, with vector-borne diseases (arthropod-transmitted pathogens), the vector plays a vital role, and without the vector there is no sustained pathogen transmission.
What is disease frequency in epidemiology?
• Measures of new cases of disease that. develop in a population during a specified. period of time. • 2 types of incidence.
What is epidemiology quizlet?
Epidemiology. the study of the distribution and determinants of health-related states or events in specified populations, and the application of this study to the control of health problems; the basic science for public health. Frequency.
What are the three 3 factors that affect the likelihood of infection from a pathogen?
Common pathogen factors are immune evasion, high viral load and low infectious dose.
What epidemiology means?
By definition, epidemiology is the study (scientific, systematic, and data-driven) of the distribution (frequency, pattern) and determinants (causes, risk factors) of health-related states and events (not just diseases) in specified populations (neighborhood, school, city, state, country, global).
What are the 3 links in the chain of infection?
Infectious agent (pathogen) Reservoir (the normal location of the pathogen) Portal of exit from the reservoir. Mode of transmission.