WGU D450: Community Health
Nursing
2026 OA Study Guide & 400+ Practice Questions
Prevention Levels, Epidemiology, Disaster Phases, and Vulnerable Populations
D450 "Must-Know" Cheat Sheet:
Level Goal Examples
Primary Prevention Immunizations, Education, Car seats
Secondary Early Detection Screenings, Self-exams, TB skin tests
Tertiary Rehab/Limit Damage PT/OT, Support groups, Chronic disease mgmt
Disaster Management: Mitigation (Prevention) -> Preparedness (Planning) -> Response
(Action) -> Recovery (Returning to normal).
Levels of Prevention
Q1: A community health nurse is organizing a blood pressure screening event at a local
senior center. This is an example of which level of prevention?
A. Primary Prevention
B. Secondary Prevention
C. Tertiary Prevention
D. Quaternary Prevention
Correct Answer: B
Rationale: Secondary prevention focuses on early detection and screening to identify diseases in their earliest
stages before clinical symptoms appear (e.g., screenings, mammograms, TB tests).
WGU D450 Community Health OA Prep - Page 1
, Epidemiology - The Epidemiological Triangle
Q2: In the epidemiological triangle, which of the following is considered an 'Environment'
factor in the spread of Lyme disease?
A. The Borrelia burgdorferi bacteria
B. The human host
C. Wooded or grassy areas with high humidity
D. The deer tick vector
Correct Answer: C
Rationale: The triangle consists of Agent (bacteria), Host (human), and Environment (wooded areas). The
environment includes physical, social, or economic factors that allow the agent and host to interact.
Vulnerable Populations - Migrant Workers
Q3: When assessing a migrant farmworker, the community health nurse should prioritize
screening for which specific health risk?
A. Lead poisoning from old housing
B. Pesticide exposure
C. High-altitude sickness
D. Vitamin D deficiency
Correct Answer: B
Rationale: Migrant farmworkers are at high risk for pesticide exposure, which can cause acute toxicity (nausea,
dizziness) or chronic issues (cancers, birth defects).
Community Assessment - Windshield Survey
Q4: A nurse is performing a windshield survey of a neighborhood. Which observation is an
example of 'Environmental Quality'?
A. The presence of several religious centers
B. The proximity of the neighborhood to a chemical plant and heavy smog
C. The age and condition of the housing
D. The types of public transportation available
Correct Answer: B
Rationale: A windshield survey is a subjective visual assessment of a community. Smog and proximity to
industrial plants fall under the category of environmental quality and potential pollutants.
WGU D450 Community Health OA Prep - Page 2
, Disaster Management - Roles
Q5: During the 'Mitigation' phase of disaster management, what is the primary goal of the
community health nurse?
A. To provide immediate first aid to survivors
B. To coordinate long-term psychological counseling
C. To identify potential risks and take steps to reduce their impact
D. To conduct a search and rescue operation
Correct Answer: C
Rationale: Mitigation (Prevention) occurs before a disaster happens. It involves identifying risks (mapping flood
plains) and taking actions to reduce loss of life and property (strengthening building codes).
Levels of Prevention
Q6: A community health nurse is organizing a blood pressure screening event at a local
senior center. This is an example of which level of prevention?
A. Primary Prevention
B. Secondary Prevention
C. Tertiary Prevention
D. Quaternary Prevention
Correct Answer: B
Rationale: Secondary prevention focuses on early detection and screening to identify diseases in their earliest
stages before clinical symptoms appear (e.g., screenings, mammograms, TB tests).
Epidemiology - The Epidemiological Triangle
Q7: In the epidemiological triangle, which of the following is considered an 'Environment'
factor in the spread of Lyme disease?
A. The Borrelia burgdorferi bacteria
B. The human host
C. Wooded or grassy areas with high humidity
D. The deer tick vector
Correct Answer: C
Rationale: The triangle consists of Agent (bacteria), Host (human), and Environment (wooded areas). The
environment includes physical, social, or economic factors that allow the agent and host to interact.
WGU D450 Community Health OA Prep - Page 3
, Vulnerable Populations - Migrant Workers
Q8: When assessing a migrant farmworker, the community health nurse should prioritize
screening for which specific health risk?
A. Lead poisoning from old housing
B. Pesticide exposure
C. High-altitude sickness
D. Vitamin D deficiency
Correct Answer: B
Rationale: Migrant farmworkers are at high risk for pesticide exposure, which can cause acute toxicity (nausea,
dizziness) or chronic issues (cancers, birth defects).
Community Assessment - Windshield Survey
Q9: A nurse is performing a windshield survey of a neighborhood. Which observation is an
example of 'Environmental Quality'?
A. The presence of several religious centers
B. The proximity of the neighborhood to a chemical plant and heavy smog
C. The age and condition of the housing
D. The types of public transportation available
Correct Answer: B
Rationale: A windshield survey is a subjective visual assessment of a community. Smog and proximity to
industrial plants fall under the category of environmental quality and potential pollutants.
Disaster Management - Roles
Q10: During the 'Mitigation' phase of disaster management, what is the primary goal of the
community health nurse?
A. To provide immediate first aid to survivors
B. To coordinate long-term psychological counseling
C. To identify potential risks and take steps to reduce their impact
D. To conduct a search and rescue operation
Correct Answer: C
Rationale: Mitigation (Prevention) occurs before a disaster happens. It involves identifying risks (mapping flood
plains) and taking actions to reduce loss of life and property (strengthening building codes).
WGU D450 Community Health OA Prep - Page 4
Nursing
2026 OA Study Guide & 400+ Practice Questions
Prevention Levels, Epidemiology, Disaster Phases, and Vulnerable Populations
D450 "Must-Know" Cheat Sheet:
Level Goal Examples
Primary Prevention Immunizations, Education, Car seats
Secondary Early Detection Screenings, Self-exams, TB skin tests
Tertiary Rehab/Limit Damage PT/OT, Support groups, Chronic disease mgmt
Disaster Management: Mitigation (Prevention) -> Preparedness (Planning) -> Response
(Action) -> Recovery (Returning to normal).
Levels of Prevention
Q1: A community health nurse is organizing a blood pressure screening event at a local
senior center. This is an example of which level of prevention?
A. Primary Prevention
B. Secondary Prevention
C. Tertiary Prevention
D. Quaternary Prevention
Correct Answer: B
Rationale: Secondary prevention focuses on early detection and screening to identify diseases in their earliest
stages before clinical symptoms appear (e.g., screenings, mammograms, TB tests).
WGU D450 Community Health OA Prep - Page 1
, Epidemiology - The Epidemiological Triangle
Q2: In the epidemiological triangle, which of the following is considered an 'Environment'
factor in the spread of Lyme disease?
A. The Borrelia burgdorferi bacteria
B. The human host
C. Wooded or grassy areas with high humidity
D. The deer tick vector
Correct Answer: C
Rationale: The triangle consists of Agent (bacteria), Host (human), and Environment (wooded areas). The
environment includes physical, social, or economic factors that allow the agent and host to interact.
Vulnerable Populations - Migrant Workers
Q3: When assessing a migrant farmworker, the community health nurse should prioritize
screening for which specific health risk?
A. Lead poisoning from old housing
B. Pesticide exposure
C. High-altitude sickness
D. Vitamin D deficiency
Correct Answer: B
Rationale: Migrant farmworkers are at high risk for pesticide exposure, which can cause acute toxicity (nausea,
dizziness) or chronic issues (cancers, birth defects).
Community Assessment - Windshield Survey
Q4: A nurse is performing a windshield survey of a neighborhood. Which observation is an
example of 'Environmental Quality'?
A. The presence of several religious centers
B. The proximity of the neighborhood to a chemical plant and heavy smog
C. The age and condition of the housing
D. The types of public transportation available
Correct Answer: B
Rationale: A windshield survey is a subjective visual assessment of a community. Smog and proximity to
industrial plants fall under the category of environmental quality and potential pollutants.
WGU D450 Community Health OA Prep - Page 2
, Disaster Management - Roles
Q5: During the 'Mitigation' phase of disaster management, what is the primary goal of the
community health nurse?
A. To provide immediate first aid to survivors
B. To coordinate long-term psychological counseling
C. To identify potential risks and take steps to reduce their impact
D. To conduct a search and rescue operation
Correct Answer: C
Rationale: Mitigation (Prevention) occurs before a disaster happens. It involves identifying risks (mapping flood
plains) and taking actions to reduce loss of life and property (strengthening building codes).
Levels of Prevention
Q6: A community health nurse is organizing a blood pressure screening event at a local
senior center. This is an example of which level of prevention?
A. Primary Prevention
B. Secondary Prevention
C. Tertiary Prevention
D. Quaternary Prevention
Correct Answer: B
Rationale: Secondary prevention focuses on early detection and screening to identify diseases in their earliest
stages before clinical symptoms appear (e.g., screenings, mammograms, TB tests).
Epidemiology - The Epidemiological Triangle
Q7: In the epidemiological triangle, which of the following is considered an 'Environment'
factor in the spread of Lyme disease?
A. The Borrelia burgdorferi bacteria
B. The human host
C. Wooded or grassy areas with high humidity
D. The deer tick vector
Correct Answer: C
Rationale: The triangle consists of Agent (bacteria), Host (human), and Environment (wooded areas). The
environment includes physical, social, or economic factors that allow the agent and host to interact.
WGU D450 Community Health OA Prep - Page 3
, Vulnerable Populations - Migrant Workers
Q8: When assessing a migrant farmworker, the community health nurse should prioritize
screening for which specific health risk?
A. Lead poisoning from old housing
B. Pesticide exposure
C. High-altitude sickness
D. Vitamin D deficiency
Correct Answer: B
Rationale: Migrant farmworkers are at high risk for pesticide exposure, which can cause acute toxicity (nausea,
dizziness) or chronic issues (cancers, birth defects).
Community Assessment - Windshield Survey
Q9: A nurse is performing a windshield survey of a neighborhood. Which observation is an
example of 'Environmental Quality'?
A. The presence of several religious centers
B. The proximity of the neighborhood to a chemical plant and heavy smog
C. The age and condition of the housing
D. The types of public transportation available
Correct Answer: B
Rationale: A windshield survey is a subjective visual assessment of a community. Smog and proximity to
industrial plants fall under the category of environmental quality and potential pollutants.
Disaster Management - Roles
Q10: During the 'Mitigation' phase of disaster management, what is the primary goal of the
community health nurse?
A. To provide immediate first aid to survivors
B. To coordinate long-term psychological counseling
C. To identify potential risks and take steps to reduce their impact
D. To conduct a search and rescue operation
Correct Answer: C
Rationale: Mitigation (Prevention) occurs before a disaster happens. It involves identifying risks (mapping flood
plains) and taking actions to reduce loss of life and property (strengthening building codes).
WGU D450 Community Health OA Prep - Page 4
