Posted: August 27th, 2015

The Epidemiologic Triad/Triangle

 
To prepare for this Discussion:

• Select one agent of an infectious disease. Select an agent of interest or an agent listed on the CDC’s website at http://wwwn.cdc.gov/nndss/script/conditionlist.aspx?type=0&yr=2013

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• Consider how the health condition applies to the epidemiologic triad (also known as the epidemiologic triangle).
To complete the Discussion, post the name of the disease you selected.

Next, apply the disease to the epidemiologic triad.
Provide an example of an agent that is associated with the disease you selected.
Provide at least three examples of environmental factors and three examples of host factors that contribute to the likelihood of transmission of that agent to an individual.
• Learning Resources

Required Resources

Media

• Presentation: What is Epidemiology?
This presentation provides a general overview of the field of epidemiology. It also serves as a summary of the topics that will be presented in this course.
• Video Webcast: Is Epidemiology in Your Future?
http://www.rwjf.org/en/about-rwjf/newsroom/newsroom-content/2008/03/is-epidemiology-in-your-future.html

This video webcast, developed by the Robert Wood Johnson Foundation, explores the various career opportunities available in the field of Epidemiology. The video also offers insights into the Young Epidemiology Scholars (YES) program.
• Video: The Age of AIDS, Part I
http://www.pbs.org/wgbh/pages/frontline/aids/view/
View at least one of the following Public Broadcasting System (PBS) video segments at some time during the course. This series of videos explores various aspects of the AIDs epidemic, including how epidemiological associations about AIDs were determined.
o Part One, Episode One: A Deadly New Disease

o Part One, Episode Two: The Spread Escalates

o Part One, Episode Four: Scientific Breakthroughs
Readings
• Course • Course Text: Friis, R., & Sellers, T. (2014). Epidemiology for public health practice (5th ed.). Burlington, MA: Jones & Bartlett.
o Chapter 1, “History and Scope of Epidemiology”

This chapter provides definitions of epidemiological concepts. In addition, it gives a brief introduction to the interdisciplinary approach of epidemiology, including an overview of the history of the field. It includes a number of case studies that illustrate the key points of the chapter.
o Chapter 2, “Practical Applications of Epidemiology” (pp. 55–83; 98–101)

Building upon the historical events that characterize the study of epidemiology, this chapter discusses the major applications of epidemiology in public health, clinical, and operational settings. The different types of prevention are also discussed.
o Chapter 12, “Epidemiology of Infectious Diseases”

This chapter explores the modes of transmission of infectious agents. In addition, the categories of infectious disease agents and their characteristics are presented. Aspects of investigating disease outbreaks are also explained.
Optional Resources

Media
• Interactive Map: Map: AIDS in the U.S.
http://www.pbs.org/wgbh/pages/frontline/aids/atlas/us.html

This interactive map identifies the HIV statistics for each state in the United States. It provides an example of the type of statistics compiled by epidemiologists. Roll over a state for more details and click on a tab to learn more.

Readings

• Course Text: Epidemiology for Public Health Practice
o “Glossary” (pp. 737–757)

It is strongly recommended that you review the Glossary and refer to it throughout the course as needed.
Websites
• BBC Historic Figures, John Snow (1813–1858)
http://www.bbc.co.uk/history/historic_figures/snow_john.shtml

BBC Historic Figures, James Lind (1716–1794)
http://www.bbc.co.uk/history/historic_figures/lind_james.shtml

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