The below information was collected following an outbreak of norovirus in indivi
ID: 3064440 • Letter: T
Question
The below information was collected following an outbreak of norovirus in individuals who attended a charity event. The event was large enough to contract out two different caterers for the evening. Luckily they had a sign in sheet at the front door so you were able to collect the information for everyone who attended. After interviewing all 5,000 individuals you discovered who ate from which caterer and who developed symptoms indicative of contracting a norovirus.
a) Calculate the prevalence of norovirus from person who ate at caterer A.
b) Calculate the prevalence of norovirus from person who ate at caterer B.
c) Calculate the prevalence different of norovirus between eating at caterer A versus caterer B.
d) Calculate the prevalence ratio between eating at caterer A versus caterer B
e) Discuss your findings from question c and d.
Developed Symptoms Did Not develop 150 160 Symptoms 1850 2840 Ate from Caterer A Ate from Caterer BExplanation / Answer
a) The prevalence of norovirus from person who ate at caterer A
Total number of persons who ate from Caterer A=2000
Number of persons who caught norovirus=150
Prevelance=(150/2000)=0.075 =7.5%
b) The prevalence of norovirus from person who ate at caterer B.
Total number of persons who ate from Caterer B=3000
Number of persons who caught norovirus=160
Prevelance=(160/3000)=0.0533=5.33%
c) Prevalence different of norovirus between eating at caterer A versus caterer B
0.075-0.053=0.022
d) The prevalence ratio between eating at caterer A versus caterer B
0.075/0.053=1.42
e) Prevelance difference is positive and prevelance ratio is greater than 1.The prevelance of norovirus is higher among persons who ate at Caterer A as compared to Caterer B.
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