Question Question 1 Endemic means that a disease: a. Occurs clearly in excess of

Question
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
Question 2
The first table shows the total number of persons who eat each of two specified food items that were possibly ifeffective with group A streptococci. The second table shows the number of sick persons (with acute sore throat) who eat each of the various specified combinations of the food items. 
Total number of persons who ate each   specified combination of food items
Ate   Tuna
Did   not Ate Tuna
Ate   egg salad
75
100
Did   not 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 Ate Tuna
Ate   egg salad
60
75
Did   not egg salad
70
15
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
e. None of the above
Question 3
According to the results shown in the preceding tables, which of the following food items (or combination of food items) is most likely to be infective?
a. Tuna only
b. Egg salad only
c. Neither tuna nor egg salad
d. Both tuna & egg salad
e. Cannot be calculated from the data
Question 4
In the study of an outbreak of an infectious disease, plotting an epidemic curve is useful because:
a. It helps to determine what type of an outbreak (e.g. single-source, person-to-person) has occurred
b. It shows whether herd immunity has occurred
c. It helps to determine the median incubation period
d. A & c
e. A,b, & c
Question 5
Which of the following is characteristic of a single-exposure, common-vehicle outbreak?
a. Frequent secondary cases
b. Increasing severity with increasing age
c. Explosive
d. Cases include both people who have been exposed & those who were not exposed
e. All of the above

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