While option 3 ("Ebola has several effects on the body, including...") is a reasonable choice and could work, option 2 ("Ebola cases affect people like Emile and his family because...") may provide a smoother transition. This option directly addresses the impact of Ebola on individuals and families, making it relevant to Emile's story and the broader consequences of the outbreak, which would naturally lead into discussing the effects of the virus on those affected.
Both options have merit, but if the goal is to maintain a narrative flow that connects Emile's experience to the wider impact of Ebola, option 2 might be the best choice.