Card 9 / 14: Influenza is spread by close contact between an infected person and an uninfected person who has not had the infection and therefore is “at risk”. There are 10 students living on your dorm floor, which is the second floor of the building. One of the students has returned on Sunday evening, October 3rd from a weekend away attending a friend’s wedding. On the morning of Tuesday, October 5th he shows all the typical symptoms of influenza including a mild fever and sore throat. By the end of the following Sunday, October 10th four other students on the floor are showing identical symptoms of influenza. What is the cumulative incidence rate for influenza for the period October 1 through October 10 on the second floor of the dorm? Your answer should be specific.

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