ATI Community Health: Epidemiology and Levels of
Prevention 2026 UPDATED ACTUAL Exam Questions and
CORRECT Answers
1. A nurse is providing education to a group of older adults about the
importance of obtaining an annual influenza vaccine. Which level of prevention
is the nurse implementing?
A. Quaternary prevention
B. Secondary prevention
C. Tertiary prevention
D. Primary prevention
Answer: D
Rationale: Primary prevention focuses on preventing the initial occurrence of a disease or
injury. Immunizations are a classic example of primary prevention.
2. Which component of the epidemiological triangle refers to the living being
that an agent or the environment influences?
A. Agent
B. Environment
C. Vector
D. Host
Answer: D
Rationale: The host is the living being (human or animal) that is affected by the agent.
,3. A community health nurse is conducting a skin cancer screening event at a
local beach. This activity represents which level of prevention?
A. Primary prevention
B. Secondary prevention
C. Tertiary prevention
D. Health promotion
Answer: B
Rationale: Secondary prevention focuses on early detection and treatment of disease.
Screenings are a primary example of secondary prevention.
4. In epidemiology, what is the term for the number of new cases of a disease in
a population at risk during a specific period of time?
A. Prevalence rate
B. Attack rate
C. Incidence rate
D. Mortality rate
Answer: C
Rationale: Incidence refers specifically to new cases, whereas prevalence includes both
new and existing cases.
5. A nurse is working with a client who has a permanent disability following a
stroke. The nurse helps the client perform range-of-motion exercises to prevent
muscle atrophy. Which level of prevention is this?
A. Primary prevention
B. Secondary prevention
C. Tertiary prevention
D. Rehabilitative prevention
Answer: C
, Rationale: Tertiary prevention focuses on rehabilitation and preventing further
complications from an existing permanent condition.
6. The presence of a specific bacteria like Mycobacterium tuberculosis in the
epidemiological triangle is considered which of the following?
A. Host
B. Agent
C. Environment
D. Reservoir
Answer: B
Rationale: The agent is the physical, infectious, or chemical factor that causes the disease.
7. A nurse is calculating the total number of people in a town who currently
have diabetes divided by the total population. Which rate is the nurse
calculating?
A. Prevalence
B. Incidence
C. Crude birth rate
D. Case fatality rate
Answer: A
Rationale: Prevalence is the number of all cases (old and new) of a specific disease in a
population at a given point in time.
8. Which environmental factor in the epidemiological triangle includes things
like poverty, access to health care, and high-stress working conditions?
A. Physical environment
B. Biological environment
C. Infectious environment
D. Social environment
Answer: D
Prevention 2026 UPDATED ACTUAL Exam Questions and
CORRECT Answers
1. A nurse is providing education to a group of older adults about the
importance of obtaining an annual influenza vaccine. Which level of prevention
is the nurse implementing?
A. Quaternary prevention
B. Secondary prevention
C. Tertiary prevention
D. Primary prevention
Answer: D
Rationale: Primary prevention focuses on preventing the initial occurrence of a disease or
injury. Immunizations are a classic example of primary prevention.
2. Which component of the epidemiological triangle refers to the living being
that an agent or the environment influences?
A. Agent
B. Environment
C. Vector
D. Host
Answer: D
Rationale: The host is the living being (human or animal) that is affected by the agent.
,3. A community health nurse is conducting a skin cancer screening event at a
local beach. This activity represents which level of prevention?
A. Primary prevention
B. Secondary prevention
C. Tertiary prevention
D. Health promotion
Answer: B
Rationale: Secondary prevention focuses on early detection and treatment of disease.
Screenings are a primary example of secondary prevention.
4. In epidemiology, what is the term for the number of new cases of a disease in
a population at risk during a specific period of time?
A. Prevalence rate
B. Attack rate
C. Incidence rate
D. Mortality rate
Answer: C
Rationale: Incidence refers specifically to new cases, whereas prevalence includes both
new and existing cases.
5. A nurse is working with a client who has a permanent disability following a
stroke. The nurse helps the client perform range-of-motion exercises to prevent
muscle atrophy. Which level of prevention is this?
A. Primary prevention
B. Secondary prevention
C. Tertiary prevention
D. Rehabilitative prevention
Answer: C
, Rationale: Tertiary prevention focuses on rehabilitation and preventing further
complications from an existing permanent condition.
6. The presence of a specific bacteria like Mycobacterium tuberculosis in the
epidemiological triangle is considered which of the following?
A. Host
B. Agent
C. Environment
D. Reservoir
Answer: B
Rationale: The agent is the physical, infectious, or chemical factor that causes the disease.
7. A nurse is calculating the total number of people in a town who currently
have diabetes divided by the total population. Which rate is the nurse
calculating?
A. Prevalence
B. Incidence
C. Crude birth rate
D. Case fatality rate
Answer: A
Rationale: Prevalence is the number of all cases (old and new) of a specific disease in a
population at a given point in time.
8. Which environmental factor in the epidemiological triangle includes things
like poverty, access to health care, and high-stress working conditions?
A. Physical environment
B. Biological environment
C. Infectious environment
D. Social environment
Answer: D
