SECURITY FORCES EXAM 3 QUESTIONS WITH
VERIFIED ANSWERS
Which of the following measures is used as the numerator to calculate the incidence
rate of a disease?
A. Number of cases observed
B. Number of asymptomatic cases
C. Number of new cases observed
D. Total population - Answers - C. Number of new cases observed
The association between low birthweight and maternal smoking during pregnancy can
be studied by obtaining smoking histories from women at the time of the first prenatal
visit and then subsequently assessing birthweight at delivery according to smoking
histories. What type of study is this?
A. Clinical trial
B. Cross sectional
C. Prospective cohort
D. Case-control - Answers - C. Prospective cohort
Choose the rate that best describes each statement below.
Death occurs in 10% of cases of meningococcal meningitis. _______ - Answers - Case
fatality rate
Choose the rate that best describes each statement below.
Approximately 9 people die each year in the United States for every 1000 estimated to
be alive. _______ - Answers - Crude mortality rate
Choose the rate that best describes each statement below.
Eighty percent of children exposed to a child with chicken pox develop the disease -
Answers - Attack rate
Choose the level of prevention that best describes each intervention below.
18 y/o male requests HPV vaccine ________ - Answers - Primary prevention
Choose the level of prevention that best describes each intervention below.
60 y/o male, hospitalized after a stroke, has orders for physical therapy and
occupational therapy upon discharge ________ - Answers - Tertiary prevention
, Choose the level of prevention that best describes each intervention below.
Health fair offers HIV testing _______ - Answers - Secondary prevention
Choose the level of prevention that best describes each intervention below.
Georgia law prohibiting texting and driving _____ - Answers - Primary prevention
The population of a city on February 15, 2005, was 36,600. The city has a 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 incidence rate of active cases of
influenza for the 3-month period was:
A. 4 per 1,000 population
B. 20 per 1,000 population
C. 60 per 1,000 population
D. 39 per 1,000 population - Answers - C. 60 per 1,000 population
T or F Prospective cohort studies are usually much less expensive than case-control
studies - Answers - False
T or F Incidence rates of a disease cannot be determined from the results of a case-
control study. - Answers - True
Which of the following is antigen-presenting cell types?
(A) Dendritic cells.
(B) B Lymphocytes.
(C) Natural Killer Cells.
(D) T cell - Answers - (C) Natural Killer Cells.
Major histocompatibility complex (MHC) refers to a large group of genes that code for
proteins that play an essential role in which of the following?
(A) Phagocytosis by macrophages
(B) Antigen presentation to T lymphocytes
(C) Phagocytosis by neutrophils
(D) Antigen presentation to B-lymphocytes - Answers - (B) Antigen presentation to T
lymphocytes
Central tolerance refers to which of the following processes?
(A) Destruction of lymphocytes that are not specific for self-antigens.
(B) Destruction of self-antigens that are specific for lymphocytes.
(C) Destruction of lymphocytes that are specific for self-antigens.
(D) Production of self-antigens that are specific for lymphocytes. - Answers - (C)
Destruction of lymphocytes that are specific for self-antigens.
VERIFIED ANSWERS
Which of the following measures is used as the numerator to calculate the incidence
rate of a disease?
A. Number of cases observed
B. Number of asymptomatic cases
C. Number of new cases observed
D. Total population - Answers - C. Number of new cases observed
The association between low birthweight and maternal smoking during pregnancy can
be studied by obtaining smoking histories from women at the time of the first prenatal
visit and then subsequently assessing birthweight at delivery according to smoking
histories. What type of study is this?
A. Clinical trial
B. Cross sectional
C. Prospective cohort
D. Case-control - Answers - C. Prospective cohort
Choose the rate that best describes each statement below.
Death occurs in 10% of cases of meningococcal meningitis. _______ - Answers - Case
fatality rate
Choose the rate that best describes each statement below.
Approximately 9 people die each year in the United States for every 1000 estimated to
be alive. _______ - Answers - Crude mortality rate
Choose the rate that best describes each statement below.
Eighty percent of children exposed to a child with chicken pox develop the disease -
Answers - Attack rate
Choose the level of prevention that best describes each intervention below.
18 y/o male requests HPV vaccine ________ - Answers - Primary prevention
Choose the level of prevention that best describes each intervention below.
60 y/o male, hospitalized after a stroke, has orders for physical therapy and
occupational therapy upon discharge ________ - Answers - Tertiary prevention
, Choose the level of prevention that best describes each intervention below.
Health fair offers HIV testing _______ - Answers - Secondary prevention
Choose the level of prevention that best describes each intervention below.
Georgia law prohibiting texting and driving _____ - Answers - Primary prevention
The population of a city on February 15, 2005, was 36,600. The city has a 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 incidence rate of active cases of
influenza for the 3-month period was:
A. 4 per 1,000 population
B. 20 per 1,000 population
C. 60 per 1,000 population
D. 39 per 1,000 population - Answers - C. 60 per 1,000 population
T or F Prospective cohort studies are usually much less expensive than case-control
studies - Answers - False
T or F Incidence rates of a disease cannot be determined from the results of a case-
control study. - Answers - True
Which of the following is antigen-presenting cell types?
(A) Dendritic cells.
(B) B Lymphocytes.
(C) Natural Killer Cells.
(D) T cell - Answers - (C) Natural Killer Cells.
Major histocompatibility complex (MHC) refers to a large group of genes that code for
proteins that play an essential role in which of the following?
(A) Phagocytosis by macrophages
(B) Antigen presentation to T lymphocytes
(C) Phagocytosis by neutrophils
(D) Antigen presentation to B-lymphocytes - Answers - (B) Antigen presentation to T
lymphocytes
Central tolerance refers to which of the following processes?
(A) Destruction of lymphocytes that are not specific for self-antigens.
(B) Destruction of self-antigens that are specific for lymphocytes.
(C) Destruction of lymphocytes that are specific for self-antigens.
(D) Production of self-antigens that are specific for lymphocytes. - Answers - (C)
Destruction of lymphocytes that are specific for self-antigens.
