An outbreak of flu occurred at a small college with a student enrollment of 870.
ID: 3172812 • Letter: A
Question
An outbreak of flu occurred at a small college with a student enrollment of 870. Fifty-five students reported symptoms including vomiting, nausea, and fever between 8 p.m. on December 24 and 8 p.m. on December 25.
Residence
Number of students
Number of cases
Male dormitory
400
40
Female dormitory
350
10
Day students
120 (40 males, 80 females)
5 (3 males, 2 females)
Total
846
55
Calculate the attack rates for males.
Residence
Number of students
Number of cases
Male dormitory
400
40
Female dormitory
350
10
Day students
120 (40 males, 80 females)
5 (3 males, 2 females)
Total
846
55
Explanation / Answer
Attack rate for males = no of males who reported symptoms/total number of males
= (40+3)/(400+40) = 43/440 (option D)
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