NR 503 Epidemiology Midterm
Questions & Answers
NR 503 Epidemiology midterm questions & answers:
1. The population of a city on February 15, 2005, was 36,600. The city has a passive surveillance
system that collects hospital and private physician reports of influenza cases every month.
During the period between January 1 and April 1, 2005, 2,200 new cases of influenza occurred in
the city. Of these cases, 775 persons were ill with influenza according to surveillance reports on
April 1, 2005. The prevalence rate of active influenza as of April 1, 2005, was:
Correct! 20 per 1,000 population
2. The population of a city on February 15, 2005, was 36,600. The city has a passive surveillance
system that collects hospital and private physician reports of influenza cases every month.
During the period between January 1 and April 1, 2005, 2,200 new cases of influenza occurred in
the city. Of these cases, 775 persons were ill with influenza according to surveillance reports on
April 1, 2005. The monthly incidence rate of active cases of influenza for the 3-month period
was:
m
er as
Correct! 20 per 1,000 population
co
eH w
3. What would be the effect on age-specific incidence rates of uterine cancer if women with
hysterectomies were excluded from the denominator of incidence calculations assuming that
o.
most women who have had hysterectomies are older than 50 years of age?
rs e
ou urc
Correct!: Rates would increase in women older than 50 years of age but may decrease in
younger women as they get older.
o
aC s
4. The ability of a single person to remain free of clinical illness following exposure to an infectious
vi y re
agent is known as:
Correct!: Immunity
ed d
5. Which of the following reasons can explain why a person who did not consume the infective
ar stu
food item got sick?
Correct: All of the above
is
6. Which of the food items (or combination of items) is most likely to be the infective item(s)?
Th
Correct!: Ice cream only
7. The case-fatality rate associated with plague is lowest in which community?
sh
Correct Answer: Community C
8. The incidence and prevalence rates of a chronic childhood illness for a specific community are
given below.
Correct Answer: The duration of disease is becoming longer.
This study source was downloaded by 100000830216776 from CourseHero.com on 09-06-2021 11:57:08 GMT -05:00
https://www.coursehero.com/file/35703218/NR-503-Epidemiology-midterm-questions-answersdocx/
, 9. The following table gives the mean annual age-specific mortality rates from measles during the
first 25 years of life in successive 5-year periods. You may assume that the population is in a
steady state (i.e., migrations out are equal to migrations in).
Based on the information above, one may conclude:
Correct Answer: Children ages 5 to 9 had the highest rate of death in all periods
10. In a country with a population of 16 million people, 175,000 deaths occurred during the year
ending December 31, 2005. These included 45,000 deaths from tuberculosis (TB) in 135,000
persons who were sick with TB. Assume that the population remained constant throughout the
year. Not all 135,000 cases of TB were contracted during 2005. Which of the following
statements is true?
Correct Answer: None of the above
11. In 2001, a state enacted a law that required the use of safety seats for all children under 7 years
m
er as
of age and mandatory seatbelt use for all persons. The table above lists the number of deaths
due to motor vehicle accidents (MVAs) and the total population by age in 2000 (before the law)
co
eH w
and in 2005 (4 years after the law was enacted).
o.
Correct Answer: Correct, because both the total and the age-adjusted mortality rates are higher
in 2005 than in 2000 rs e
ou urc
12. Which of the following is an advantage of active surveillance?
o
Correct!: More accurate due to reduced reporting burden for health care providers
aC s
vi y re
13. A disease has an incidence of 10 per 1,000 persons per year, and 80% of those affected will die
within 1 year. Prior to the year 2000, only 50% of cases of the disease were detected by
physician diagnosis prior to death. In the year 2000, a lab test was developed that identified 90%
of cases an average of 6 months prior to symptom onset; however, the prognosis did not
ed d
improve after diagnosis. Which statement is true concerning the duration of the disease after
ar stu
the development of the lab test?
Correct Answer: Mean duration of a case of the disease is longer in 2000
is
14. What is the overall attack rate in persons who did not eat ice cream?
Th
Correct!: 33%
15. The table above describes the number of illnesses and deaths caused by plague in four
sh
communities. The proportionate mortality ratio associated with plague is lowest in which
community?
Correct!: Community D
16. Which of the following is characteristic of a single-exposure, common-vehicle outbreak?
This study source was downloaded by 100000830216776 from CourseHero.com on 09-06-2021 11:57:08 GMT -05:00
https://www.coursehero.com/file/35703218/NR-503-Epidemiology-midterm-questions-answersdocx/
Questions & Answers
NR 503 Epidemiology midterm questions & answers:
1. The population of a city on February 15, 2005, was 36,600. The city has a passive surveillance
system that collects hospital and private physician reports of influenza cases every month.
During the period between January 1 and April 1, 2005, 2,200 new cases of influenza occurred in
the city. Of these cases, 775 persons were ill with influenza according to surveillance reports on
April 1, 2005. The prevalence rate of active influenza as of April 1, 2005, was:
Correct! 20 per 1,000 population
2. The population of a city on February 15, 2005, was 36,600. The city has a passive surveillance
system that collects hospital and private physician reports of influenza cases every month.
During the period between January 1 and April 1, 2005, 2,200 new cases of influenza occurred in
the city. Of these cases, 775 persons were ill with influenza according to surveillance reports on
April 1, 2005. The monthly incidence rate of active cases of influenza for the 3-month period
was:
m
er as
Correct! 20 per 1,000 population
co
eH w
3. What would be the effect on age-specific incidence rates of uterine cancer if women with
hysterectomies were excluded from the denominator of incidence calculations assuming that
o.
most women who have had hysterectomies are older than 50 years of age?
rs e
ou urc
Correct!: Rates would increase in women older than 50 years of age but may decrease in
younger women as they get older.
o
aC s
4. The ability of a single person to remain free of clinical illness following exposure to an infectious
vi y re
agent is known as:
Correct!: Immunity
ed d
5. Which of the following reasons can explain why a person who did not consume the infective
ar stu
food item got sick?
Correct: All of the above
is
6. Which of the food items (or combination of items) is most likely to be the infective item(s)?
Th
Correct!: Ice cream only
7. The case-fatality rate associated with plague is lowest in which community?
sh
Correct Answer: Community C
8. The incidence and prevalence rates of a chronic childhood illness for a specific community are
given below.
Correct Answer: The duration of disease is becoming longer.
This study source was downloaded by 100000830216776 from CourseHero.com on 09-06-2021 11:57:08 GMT -05:00
https://www.coursehero.com/file/35703218/NR-503-Epidemiology-midterm-questions-answersdocx/
, 9. The following table gives the mean annual age-specific mortality rates from measles during the
first 25 years of life in successive 5-year periods. You may assume that the population is in a
steady state (i.e., migrations out are equal to migrations in).
Based on the information above, one may conclude:
Correct Answer: Children ages 5 to 9 had the highest rate of death in all periods
10. In a country with a population of 16 million people, 175,000 deaths occurred during the year
ending December 31, 2005. These included 45,000 deaths from tuberculosis (TB) in 135,000
persons who were sick with TB. Assume that the population remained constant throughout the
year. Not all 135,000 cases of TB were contracted during 2005. Which of the following
statements is true?
Correct Answer: None of the above
11. In 2001, a state enacted a law that required the use of safety seats for all children under 7 years
m
er as
of age and mandatory seatbelt use for all persons. The table above lists the number of deaths
due to motor vehicle accidents (MVAs) and the total population by age in 2000 (before the law)
co
eH w
and in 2005 (4 years after the law was enacted).
o.
Correct Answer: Correct, because both the total and the age-adjusted mortality rates are higher
in 2005 than in 2000 rs e
ou urc
12. Which of the following is an advantage of active surveillance?
o
Correct!: More accurate due to reduced reporting burden for health care providers
aC s
vi y re
13. A disease has an incidence of 10 per 1,000 persons per year, and 80% of those affected will die
within 1 year. Prior to the year 2000, only 50% of cases of the disease were detected by
physician diagnosis prior to death. In the year 2000, a lab test was developed that identified 90%
of cases an average of 6 months prior to symptom onset; however, the prognosis did not
ed d
improve after diagnosis. Which statement is true concerning the duration of the disease after
ar stu
the development of the lab test?
Correct Answer: Mean duration of a case of the disease is longer in 2000
is
14. What is the overall attack rate in persons who did not eat ice cream?
Th
Correct!: 33%
15. The table above describes the number of illnesses and deaths caused by plague in four
sh
communities. The proportionate mortality ratio associated with plague is lowest in which
community?
Correct!: Community D
16. Which of the following is characteristic of a single-exposure, common-vehicle outbreak?
This study source was downloaded by 100000830216776 from CourseHero.com on 09-06-2021 11:57:08 GMT -05:00
https://www.coursehero.com/file/35703218/NR-503-Epidemiology-midterm-questions-answersdocx/
