SUBJECT: EPIDEMIOLOGY Calculate the 10-day cumulative incidence: Influenza is sp
ID: 3004261 • Letter: S
Question
SUBJECT: EPIDEMIOLOGY
Calculate the 10-day cumulative incidence: 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.
Imagine that there are 10 students living on your dorm floor, which is the second floor of the building. One of the students has returned on the evening of Sunday, October 3rd, from a weekend away at 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. 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. The ten-day cumulative incidence for the second floor of the dorm is:
Explanation / Answer
ten-day cumulative incidence for the second floor of the dorm is
= no. of person affected/ total no. of person-time @risk
No. of affected person = 1 + 4 = 5
Total students @risk = 10
So, ten-day cumulative incidence for the second floor of the dorm = 5/10 = 0.5 or 50%
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