Question

ATThe data in the following Table were obtained, shortly after the outbreak, from a questionnaire completed by everyone on board the ship.

Food	People Who Ate Food		People Who Did Not Eat
	Sick	Well	Sick	Well
Herring	200	800	100	900
Chicken	650	350	100	900
Spinach Souffle	200	800	500	500
Oysters	300	700	400	600
Chocolate Mousse	600	400	450	550

1)       Calculate the attack rates for each food and show your work.

2)       What is the most likely infective food on the cruise ship?

1. Herring
2. Chicken
3. Spinach soufflé
4. Oysters
5. Chocolate mousse
   

3)      What is the relative risk of developing gastritis for herring consumption? Show your calculation.

1. 0.5
2. 2.0
3. 2.3
4. 8.0

  

Answer 1