ATI Community Health: Epidemiology and Disease
Transmission Practice Pack 2026 UPDATED ACTUAL Exam
Questions and CORRECT Answers
1. Which component of the epidemiological triangle refers to the physical,
social, or biological factors that contribute to the disease process?
A. Agent
B. Host
C. Environment
D. Vector
Answer: C
Rationale: The environment involves all external factors that affect the agent and the host,
including physical, social, and biological conditions.
2. A nurse is investigating a new outbreak of measles in a local elementary
school. Which epidemiological measure describes the number of new cases
within a specific timeframe?
A. Prevalence rate
B. Mortality rate
C. Attack rate
D. Incidence rate
Answer: D
Rationale: Incidence rate measures the number of new cases of a disease in a population
over a specific period.
,3. A community health nurse is conducting a skin cancer screening event. This is
an example of which level of prevention?
A. Primary prevention
B. Secondary prevention
C. Tertiary prevention
D. Quaternary prevention
Answer: B
Rationale: Secondary prevention focuses on early detection and screening to identify
diseases in their earliest stages.
4. Which of the following is an example of primary prevention for infectious
diseases?
A. Administering the influenza vaccine
B. Testing a client for HIV after exposure
C. Providing DOT therapy for a patient with TB
D. Rehabilitating a client with post-polio syndrome
Answer: A
Rationale: Primary prevention aims to prevent the onset of disease through measures
such as immunization.
5. A client contracts Malaria after being bitten by an infected mosquito. What
type of transmission does this represent?
A. Direct contact
B. Vector-borne transmission
C. Airborne transmission
D. Fomite-borne transmission
Answer: B
Rationale: Vector-borne transmission occurs when a living insect or animal (the vector)
transmits an infectious agent to a human.
, 6. Which epidemiological term describes a disease that is constantly present in a
specific geographic area or population?
A. Epidemic
B. Pandemic
C. Outbreak
D. Endemic
Answer: D
Rationale: An endemic disease is one that is habitually present in a certain region (e.g., the
common cold).
7. In the chain of infection, a contaminated water fountain serves as which of
the following?
A. Portal of entry
B. Susceptible host
C. Portal of exit
D. Reservoir
Answer: D
Rationale: A reservoir is the habitat (living or non-living) in which an infectious agent
lives, grows, and multiplies.
8. What is the primary goal of tertiary prevention?
A. Preventing the initial occurrence of disease
B. Limiting disability and promoting rehabilitation
C. Early diagnosis and treatment
D. Identifying community risk factors
Answer: B
Rationale: Tertiary prevention aims to reduce the impact of long-term disease and
disability through rehabilitation and management.
Transmission Practice Pack 2026 UPDATED ACTUAL Exam
Questions and CORRECT Answers
1. Which component of the epidemiological triangle refers to the physical,
social, or biological factors that contribute to the disease process?
A. Agent
B. Host
C. Environment
D. Vector
Answer: C
Rationale: The environment involves all external factors that affect the agent and the host,
including physical, social, and biological conditions.
2. A nurse is investigating a new outbreak of measles in a local elementary
school. Which epidemiological measure describes the number of new cases
within a specific timeframe?
A. Prevalence rate
B. Mortality rate
C. Attack rate
D. Incidence rate
Answer: D
Rationale: Incidence rate measures the number of new cases of a disease in a population
over a specific period.
,3. A community health nurse is conducting a skin cancer screening event. This is
an example of which level of prevention?
A. Primary prevention
B. Secondary prevention
C. Tertiary prevention
D. Quaternary prevention
Answer: B
Rationale: Secondary prevention focuses on early detection and screening to identify
diseases in their earliest stages.
4. Which of the following is an example of primary prevention for infectious
diseases?
A. Administering the influenza vaccine
B. Testing a client for HIV after exposure
C. Providing DOT therapy for a patient with TB
D. Rehabilitating a client with post-polio syndrome
Answer: A
Rationale: Primary prevention aims to prevent the onset of disease through measures
such as immunization.
5. A client contracts Malaria after being bitten by an infected mosquito. What
type of transmission does this represent?
A. Direct contact
B. Vector-borne transmission
C. Airborne transmission
D. Fomite-borne transmission
Answer: B
Rationale: Vector-borne transmission occurs when a living insect or animal (the vector)
transmits an infectious agent to a human.
, 6. Which epidemiological term describes a disease that is constantly present in a
specific geographic area or population?
A. Epidemic
B. Pandemic
C. Outbreak
D. Endemic
Answer: D
Rationale: An endemic disease is one that is habitually present in a certain region (e.g., the
common cold).
7. In the chain of infection, a contaminated water fountain serves as which of
the following?
A. Portal of entry
B. Susceptible host
C. Portal of exit
D. Reservoir
Answer: D
Rationale: A reservoir is the habitat (living or non-living) in which an infectious agent
lives, grows, and multiplies.
8. What is the primary goal of tertiary prevention?
A. Preventing the initial occurrence of disease
B. Limiting disability and promoting rehabilitation
C. Early diagnosis and treatment
D. Identifying community risk factors
Answer: B
Rationale: Tertiary prevention aims to reduce the impact of long-term disease and
disability through rehabilitation and management.
