Within 10 days of attending a wedding at a Motown in Detroit, an outbreak of cyc
ID: 2935613 • Letter: W
Question
Within 10 days of attending a wedding at a Motown in Detroit, an outbreak of cyclosporiasis occurred among attendees. Of the 83 guests and wedding party members, 79 were interviewed; 54 of the 79 met the case definition. The following contingency table shows consumption of wedding cake (that had raspberry) and illness status.
Disease Status
Ate Wedding Cake
Ill
Well
Total
Yes
50
3
53
No
4
22
26
Total
54
25
79
Compute the overall attack rate
What is the proportion of those who ate the wedding cake among those who fell ill
What is the fraction 50/53 measuring?
The best estimate of the association between wedding cake and illness is?
Disease Status
Ate Wedding Cake
Ill
Well
Total
Yes
50
3
53
No
4
22
26
Total
54
25
79
Explanation / Answer
a) attack rate is the total number of new cases divided by the total population.
Attack rate = 50/79 = 0.6329
b) 50/54
c) proportion of those who fell ill among those who ate the wedding cake
d) Odds ratio = (50/3)/(4/22) = 91.7
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