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 simulta-
neously
d. Exhibits a seasonal pattern
e. Is prevalent among animals - ANS b
Questions 2 and 3 are based on the information given below:
The first table shows the total number of persons who ate each of two specified food
items that were possibly infective with group A strep- tococci. The second table shows
the number of sick persons (with acute sore throat) who ate each of the various
specified combinations of the food items. (Click the link to see the image of the charts).
https://drive.google.com/file/d/1ZCVyNMwnvoC1fG5CAGfS4UJ88tF4s8wP/view?usp=s
haring
2. What is the sore throat attack rate in persons who ate both egg salad and tuna? a.
60/75 b. 70/200
c. 60/135 d. 60/275 e. None of the above - ANS a
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 and egg salad
e. Cannot be calculated from the data given - ANS b
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 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 and c
e. a,b,and c - ANS d
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 and those who were not exposed
e. All of the above - ANS c
1. At an initial examination in Oxford, Mass., migraine headache was found in 5 of 1,000
men aged 30 to 35 years and in 10 of 1,000 women aged 30 to 35 years. The inference
that women have a two times greater risk of developing migraine headache than do
men in this age group is:
a. Correct
b. Incorrect, because a ratio has been used to
compare male and female rates
c. Incorrect, because of failure to recognize the
effect of age in the two groups
d. Incorrect, because no data for a comparison
or control group are given
e. Incorrect, because of failure to distinguish
between incidence and prevalence - ANS e
2. A prevalence survey conducted from January 1 through December 31, 2012,
identified 1,000 cases of schizophrenia in a city of 2 million persons. The incidence rate
of schizophrenia in this population is 5/100,000 persons each year. What percent of the
1,000 cases were newly diag- nosed in 2012? - ANS 10%
3. Which of the following is an advantage of active surveillance?
a. Requires less project staff
b. Is relatively inexpensive to employ
c. More accurate due to reduced reporting burden for health care providers
d. Relies on different disease definitions to account for all cases
e. Reporting systems can be developed quickly - ANS c
4. What would be the effect on age-specific inci- dence rates of uterine cancer if women
with hysterectomies were excluded from the denomi- nator of the calculations,
assuming that there are some women in each age group who have had
hysterectomies?
a. The rates would remain the same
b. The rates would tend to decrease
c. The rates would tend to increase
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