Five people eat dinner in a restaurant. Susan has steak, potatoes, corn, milk, and cheesecake; Robert has steak, potatoes, salad, corn, and cheesecake; Zach has potatoes, salad, chicken, corn, and milk; Dave has steak, potatoes, salad, milk, and cheesecake; and Tracy has steak, potatoes, salad, corn, milk, and cheesecake. Afterwards, all of them become sick from something they ate.

What food caused the sickness?

Using the method of agreement, you can conclude that the cause of the sickness was probably the food item that all of them consumed.

Using the method of agreement in epidemiological investigation, the probable food items causing the sickness in this case can be either potatoes or steak as these were common in all the meals. Additional information is needed for a definite conclusion.

Explanation:

The question is focused on determining what food caused the sickness in a group of people who ate at a restaurant. Given the details provided, one method used in epidemiology to ascertain the probable cause of an outbreak is the method of agreement. This involves looking for a common factor in all instances of the event. In this case, the common factor in the food consumed by all five individuals is potatoes and steak.

The process of elimination based on the information given leads us to these two options. However, to accurately pinpoint the source of the illness, additional information would be required such as food preparation methods, how the food was stored, and whether other diners who had the same food items also became ill.

This method of epidemiological investigation for foodborne illness is vital in public health to control and prevent the further spread of disease.

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