The introductory paragraph primarily introduces the 2014 Ebola outbreak.
This conclusion is based on the following observations from the passage:
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Focus on Emile and the Outbreak: The passage begins with the story of Emile, who is identified as patient zero for the Ebola virus during the 2014 outbreak. His illness and subsequent deaths in his family underscore the outbreak's beginnings.
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Context of Previous Outbreaks: The text mentions that there have been more than two dozen outbreaks since 1976, but it specifically highlights that the 2014 outbreak was the most devastating, suggesting its importance and relevance to the topic.
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Emphasis on the Timeline: The mention of specific dates (December 2013 and early January 2014) connects the narrative directly to the timeline of the Ebola outbreak of 2014, situating Emile's story within a larger context of disease spread.
While the passage also touches on themes such as the spread of viruses and the history of Ebola, the primary focus of the introduction is on the 2014 outbreak itself, making it the best choice.