The epidemiologic triad is a fundamental concept that represents the concept of disease causation (Gordis, 2014). The triad involves the interaction between the human host and infectious agent with possible environmental and/or vector factors contributing to the transmission. The U.S. Department of Health and Human Services (HHS) states the key concepts of causation of a disease is to answer the synonyms known as the 5 W’s., including what, who, where, when, and why/how (HHS, 2006). This essential information has been used for centuries to examine the concepts of disease causation and prevention of the disease. In the 19th century, John Snow discovered who, where, when and how of cholera disease without any knowledge of microorganisms or the biology of disease. The data collection of four of the five W’s assisted with identifying the contaminated water and decreasing the cholera epidemic in London (Gordis, 2014).…show more content… The “what” of the causation is the infectious agent known as the Ebola virus which was first discover in 1976 and since then has appeared sporadically in Africa until 2014 outbreak. In regards to “who”, the CDC (2015) states Ebola can cause disease in humans and has been found in fruit bats and primates (apes and monkeys) in Africa region. The “where” and “when” of outbreak was easily identified by CDC (2015) with the majority of cases affecting West
