Question 1

Endemic means that a disease:

a. Occurs clearly in excess of normal expectancy

b. Is habitually present in human populations

c. Affects a large number of countries simultaneously

d. Exhibits a seasonal pattern

e. Is prevalent among animals

Table who ate egg salad & who did not eat egg salad

Total number of persons who ate each specified combination of food items

 

Ate tuna

Did not eat tuna

 

Ate egg salad

75

100

 

Did not eat egg salad

200

50

Total number of persons who ate each specified combination of food items & who later became sick (with acute sore throats)

 

Ate   tuna

Did not   eat tuna

 

Ate egg   salad

60

75

 

Did not   eat egg salad

70

15

Question 2

What is the sore throat attack rate in persons who ate both egg salad & tuna?

a. 60/75

b. 70/200

c. 60/133

d. 60/275

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