Question

You have just finished administering a food/drink questionnaire to ill and non-ill participants in a Minnesota summer picnic party. The ill individuals developed moderate to severe diarrhea 16 to 46 hours after the picnic. Six persons experienced vomiting. The following data were collected:

	ATE			DID NOT EAT
	Number of people			Number of people
Food item	Ill	Not ill	Total	Ill	Not ill	Total
Hot dogs	40	30	70	10	20	30
Hamburgers	32	8	40	20	40	60
Potato salad	45	25	70	15	25	40
Ice cream	48	12	60	2	38	40
Lemonade	20	40	60	20	20	40

1) Calculate the % ill (for each food item served) for persons who ate and for persons who did not each the food item.

	ATE			DID NOT EAT
Food item	% Ill			% Ill
Hot dogs
Hamburgers
Potato salad
Ice cream
Lemonade

2) Which food item appears to be the most probable vehicle for the agent infection associated with the illness?

                        A.        Hot dogs

                        B.        Hamburgers

                        C.        Potato salad

                        D.        Ice cream

                        E.         Lemonade

im pretty sure the answer to 2 is ice cream just wanted to make sure, and if you could explain how to do #1?

Answer 1

0 * Total number of poople who ato hot dogs to Total number of people who got all : 40 6% age illa 4 x100 =57.14.) Total number of people who are Hamburgers = 40 Total number of people who got all = 32 %, age ill = 2 x 100 1 - 80% Total number of people who ate potato salad has to Total number of people who got ill 45 page ill> 45 x100 - 64.28.10 40 * * Total number of people whoate ice cream = 60 Total number of people who get all = 48. - lage &ll= 48 x 100 - 4801) * Total number of people who ate Lemonede = 60 Total number of people who got all = 20 %, age ll= 20 x 100 60 2 33:3397

- Total number of people who did not Total number of people who got eat Hot dogs = 30 ill=10 Yrage illa 100 x 100 = 33.3310 - Total pea number of people who did not eat Hamburgersal Total incumber of people who got ill = 20 lage Ell = 20 X100 -33.33 * Total number of people who did not eat potato salad 240 Total number of people who got illa 15= yage žll = levo x (37.51 Total number of people who did not eat ice cream a 40 Total number of people who got ill az to age ¿bl= 2 0 x100 SD Total number of people who did not eat hem on ade : 40 Total number of people who yol got s10 illa - 20 wege ili 2 x too 250. * *

ATE DID NOT EAT .1. ill food item ol. 211 1. 33:33) 33:33.1, Hot dogs. Hamburgers Potato salad ice cream Lemonade. 57.14% 80/ 64.28.11 37.57 5.11 5011 80% 33.33%

3 from the table in question 1 804 people got ill by eating hamburger & icecream. Theis one of these have to be the vector where as people who did not eat hamburger a tott. 33.334. And people who did not eat ice cream only 5 4 got all. comparing these data 95% of people who did not eat ice cream were not all. Thes ice cream has to be the most probable vector of infection. got ill.