Understanding the Epidemiologic Triangle

What are the three major factors in the epidemiologic triangle?

• Agent, host, and vector

• Agent, host, and environment

• Host, environment, and vector

• Agent, vector, and environment

In the context of the epidemiologic triangle, what does the term "host" refer to?

• A microorganism causing disease

• The environment where the disease exists

• A person or animal that harbours an infectious agent

• A chemical substance causing disease

Which of the following best describes the "environment" in the epidemiologic triangle?

• The internal organs of a host

• The domain external to the individual human host where agents may exist

• The genetic makeup of the host

• The immune response of the host

What is an "agent" in the context of the epidemiologic triangle?

• A person who studies diseases

• A factor such as a microorganism or chemical substance that causes disease

• A protective measure against disease

• A type of vaccine

Which of the following is NOT a component of the epidemiologic triangle?

• Host

• Agent

• Vector

• Environment

How can the epidemiologic triangle be applied outside of infectious disease epidemiology?

• It cannot be applied outside of infectious diseases

• It provides a framework for organising the causality of other types of environmental problems

• It is used to develop vaccines

• It is used to study genetic disorders

What does the term "infectious agent" refer to in epidemiology?

• A person who spreads disease

• A microorganism or pathogen that causes disease

• A chemical that prevents disease

• A vaccine component

Which of the following is an example of an "agent" in the epidemiologic triangle?

• A healthy diet

• A virus

• A warm climate

• A vaccination program

In the epidemiologic triangle, which factor is described as "all that which is external to the individual human host"?

• Host

• Agent

• Environment

• Vector

What role does the "host" play in the epidemiologic triangle?

• It is the source of the disease

• It provides subsistence or lodgement to an infectious agent

• It is the environment where the disease thrives

• It is the vector that transmits the disease