Endemic means that a disease: a. Occurs clearly in excess of normal expectancy b. Is habitually present in human pop
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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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