The epidemiologists have contacted the school. You have been requested to join them in conducting a site visit of the school.

Please answer these questions:

• Based on the information that you obtained during your site visit, did the outbreak occur in the school cafeteria or at the school party?  Explain.

• What is the incidence rate of this foodborne illness?

• In general, what is the difference between an incidence rate and a prevalence rate?

   

  Site Visit to School During your meeting, the school nurse informs you that the students who were ill ate lunch in the cafeteria every day.  They also had a class party for both sixth grade classes on Friday afternoon, January 11.  She mentioned that the kids had mostly diarrhea, fever, and some vomiting.   FOR GRADES K-6 Hours: 11:00a.m. -12:00 p.m.  Monday Tuesday Wednesday Thursday Friday 1/7 1/8 1/9 1/10 1/11 Chili Cheese Dog on Bun    Brussel Sprouts  Fruit Cup Milk Fish on Bun    Spinach Cup  Apple Sauce Milk Chicken and Noodles    Diced Carrots    Bread & Butter Milk Nachos w/ Beef and Cheese  Green Salad  Bread & Butter Milk Chicken Nuggets  Green Peas Rice Milk   January 11 - 2:00 p.m. Party Purchased from Mom and Pop's Chicken: Barrel of Chicken Potato Salad Purchased from Shop N' Slop Grocery Store: Ice Cream Potato Chips Pepsi Home-Prepared Apple pie with whipped cream topping    Elementary School - Class List Grade Classroom Number of Students  Number Ill K 10 58 0 11 60 0 1 12 58 0 13 60 0 2 14 56 0 15 56 0 3 20 58 0 21 56 0 4 22 58 0 23 60 0 5 24 60 0 25 60 0 6 100 50 20 102 50 20 TOTAL   800 40

   
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