The above information represents the total number of cases of salmonellosis asso

Question

The above information represents the total number of cases of salmonellosis associated with a chicken meal during the month of January 2010 in a city of one million inhabitants, of which it is estimated that 80% eat chicken.

a) What is the cumulative incidence for the period of the study?

b) Between January 15th and January 18th inclusively, 22 people who suffered from salmonellosis reported that they had eaten chicken distributed by the company "Good Chicken". It is estimated that among consumers of chicken, 10% consume chicken of the "Good Chicken" brand. What is the relative risk of salmonellosis associated with consumption of the "Good Chicken" brand?

Explanation / Answer

Total no. of people who catch the disease in January 2010 = 1+1+2+2+8+32+38+38+37+12+6+2+1=180

Incidence rate = 180/1,000,000 = 0.18 per million per month acquire the disease.

Cumulative incidence rate = number of new cases during a period divided by the number of subjects at risk in the population at the beginning of the study.

80% of 1 million were at risk initially = 80 * 1,000,000 / 100 = 800,000

Cumulative incidence rate = 180/ 800,000 = 22.5 * 10^-5

** Please post b part separately for detailed explanation.

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