Section 2 Food-Borne Outbreak one hundred fifty served. and People attended a ch

Question

Section 2 Food-Borne Outbreak one hundred fifty served. and People attended a charity luncheon in which two different menus were hours A total of 76 attendees reported symptoms including nausea, vomiting, abdominal and dia dishes after the beginning of the 76 who became sick reported symptoms about six The that were of the luncheon. The lasted from four to seven hours. The table below shows baked loaf, mashed and geen beant the data collected from this investigation. Charity Luncheon outbreak Data Ato Food Item Did Not Eat Food item Item ill Not III Attack Attack Relative 45 Total Rate lli Not III Total Rate Risk Meat loaf 74 100 34 Baked (74) 26 100 ZN (24) 5 45 50 chicken Mashed (4) 38 42 40) 39 79 potatoes Green 40 39 a 50.6 5.3 38 42 MRound attack rates and RRs to the hundredths. 1. Complete the table above. Calculate the attack rates and relative risk and fill in these columns in the table. Round attack rates and RRs to the hundredths. 2. There were two menus people could choose from (each with a meat and a vegetable). From the RRs you calculate above (#1), list the two food items included in each of the two menus served. After the calculaton Relatie Risk (RR and tala and lookma at we large number of faple away those who ate same of the food item s is Possible guess that he menus sened were 0) meat toaf wah mased potatoes and (2) backed chicken with geen beans

Explanation / Answer

Answer:

Based on the given information:

The Attack Rate can be calcuated as:

Attack Rate (AR) = number of cases in the population at risk / number of people in the population at risk

Relative Risk can be calculated as:

Relative Risk (RR) = Attack rate for those who ate food "A" / Attack rate for those who didnot eat food "A"

Filled table:

Q: There were two menus people could choose from, list the two items included in the each of the two menus served

Menus served:

The number of people affected is the most with the combination of the baked chicken and green beans, therefore its possible that these two items were part of a single menu. The second menu, hence, consists of Meat loaf and mashed potatoes.

3) To determine which food items are responsible, is it enough to calculate the ARs for those who ate the items?

The highest attack rates are reported for baked chicken (74) and green beans (50.63). So any of these two or both of these could be responsible for the outbreak. But there is other population which didnot consume these food items but still reported ill. Therefore a comprehensive review is required considering both populations (who ate and didnot eat) to determine with confidence which food items caused the outbreak.

4) Using the RRs identify the food items you believe is most responsible for the outbreak. Explain.

Relative risk is highest for baked chicken (7.4) and this food item was served along with green beans in the menu. Since the relative risk of the green beans is low (5.32) therefore baked chicken could be the primarily causative item responsible for the outbreak.

Ate Food Item Did Not Eat Food Item Food Item Ill Not Ill Total Attack Rate Ill Not Ill Total Attack Rate Relative Risk Meat Loaf 5 45 50 10.00 74 26 100 74 0.14 Baked Chicken 74 26 100 74.00 5 45 50 10 7.40 Mashed Potatoes 4 38 42 9.52 40 39 79 50.6 0.19 Green Beans 40 39 79 50.63 4 38 42 9.5 5.32

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