1.The following table represents the results of a study to investigate an outbre
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Question
1.The following table represents the results of a study to investigate an outbreak of gastroenteritis in California. Using the data in table 4 (the table below), complete the following:
a.Attack rate (AR) for those who ate the specific identified food and those who did not eat these food [ONE POINT]
b.The relative risk (RR) for each specific identified food [ONE POINT]
c.Which food is the most likely cause of the outbreak? Why? [ONE POINT]
d.What steps you will take after the identification of the source of outbreak? [ONE POINT]
Table 4. results of a retrospective cohort study
Food
Ate
Did not eat
Ill
well
total
AR
Ill
well
total
AR
RR
Meat
12
22
35
30
Spinach
35
5
10
22
Potato
10
43
10
30
Salad
20
6
10
37
Ice cream
2
28
2
19
Explanation / Answer
Table 4: Results of a retrospective coherent study
Food
Ate Did not eat
Ill Well Total AR Ill Well Total AR RR
Meat 12 22 34 0.3529 35 30 65 0.5385 0.6553
Spinach 35 5 40 0.8750 10 22 32 0.3125 2.8000
Potato 10 43 53 0.1887 10 30 40 0.2500 0.7548
Salad 20 6 26 0.7692 10 37 47 0.2128 3.6147
Ice cream 2 28 30 0.0667 2 19 21 0.0952 0.7006
(a) Attack Rate (AR) = Number of persons ill/Total number of persons
AR for Number of persons ate and Number of persons did not eat are given in the Table for all specified food.
(b) Relative Risk (RR) = AR for who did not eat/AR for who ate are given in the Table for all specified food.
(c) Salad is most likely to cause outbreak, because RR for Salad is highest.
(d) After identification of source of outbreak as Salad, Steps we will take: Reduce intake of Salad
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