WGU D589 CHRONIC AND INFECTIOUS DISEASES
OBJECTIVE ASSESSMENT V1 | 150 QUESTIONS AND
CORRECT ANSWERS WITH RATIONALES | HLTH 3600 |
2026 UPDATED
CORE DOMAINS
• Foundations of Chronic and Infectious Disease
• Epidemiology and Disease Measurement
• Chain of Infection and Transmission
• Immunity, Vaccination, and Herd Immunity
• Chronic Disease Pathophysiology and Risk Factors
• Infectious Disease Pathophysiology and Virulence
• Prevention Strategies Across the Lifespan
• Social Determinants of Health and Health Equity
• Emerging and Re-emerging Infectious Diseases
• Antimicrobial Resistance and Stewardship
• Public Health Surveillance and Reporting
• Disease Management and Patient Education
Purpose of the Exam
This comprehensive examination assesses the student's mastery of chronic and
infectious disease concepts essential for population health and clinical practice. It
evaluates competence in applying epidemiological principles, understanding
disease transmission and prevention, analyzing risk factors for chronic conditions,
and implementing evidence-based interventions. The multiple-choice and
scenario-based structure emphasizes real-world application, clinical decision-
,making, and the integration of public health and patient-centered care. Successful
performance demonstrates readiness to analyze disease patterns, educate
patients and communities, and contribute to disease prevention and management
efforts.
SECTION ONE: QUESTIONS 1–150
Question 1
A public health nurse is analyzing disease patterns in a community. The nurse
notes that a disease has a low incidence but a long duration. Which measure best
reflects the burden of this chronic illness in the community?
A. Incidence rate
B. Prevalence rate
C. Mortality rate
D. Case fatality rate
Correct answer: B
RATIONALE: Prevalence measures the total number of existing cases (new and
old) in a population at a given time, making it the best measure of disease burden
for chronic conditions with long duration. Option A, incidence, measures only new
cases and does not reflect the total burden. Option C, mortality, measures deaths,
not the number of people living with the disease. Option D, case fatality,
measures the proportion of diagnosed cases that die, not the overall burden of
illness in the population.
Question 2
A nurse is educating a patient about the difference between chronic and acute
diseases. Which statement by the patient indicates correct understanding?
A. "Chronic diseases always resolve with treatment."
B. "Acute diseases develop gradually over many years."
C. "Chronic diseases are long-term and often require ongoing management."
,D. "Acute diseases are never life-threatening."
Correct answer: C
RATIONALE: Chronic diseases are characterized by long duration, slow
progression, and the need for ongoing management. Option A is incorrect
because chronic diseases typically cannot be cured. Option B is incorrect because
acute diseases have a sudden onset. Option D is incorrect because acute diseases
such as myocardial infarction and sepsis can be life-threatening.
Question 3
A community health nurse is investigating an outbreak of hepatitis A. Which of
the following is the most likely mode of transmission?
A. Airborne
B. Bloodborne
C. Fecal-oral
D. Vector-borne
Correct answer: C
RATIONALE: Hepatitis A is transmitted through the fecal-oral route, often via
contaminated food or water. Option A is incorrect because hepatitis A is not
airborne. Option B is incorrect because hepatitis A is not primarily bloodborne;
hepatitis B and C are transmitted through blood. Option D is incorrect because
hepatitis A is not vector-borne.
Question 4
A nurse is reviewing the chain of infection model. Which of the following
represents the correct sequence?
A. Portal of entry, susceptible host, causative agent, reservoir, portal of exit,
mode of transmission
B. Causative agent, reservoir, portal of exit, mode of transmission, portal of entry,
susceptible host
, C. Reservoir, causative agent, portal of entry, mode of transmission, portal of exit,
susceptible host
D. Susceptible host, causative agent, reservoir, mode of transmission, portal of
exit, portal of entry
Correct answer: B
RATIONALE: The chain of infection is: causative agent → reservoir → portal of
exit → mode of transmission → portal of entry → susceptible host. Option A is
incorrect because it does not follow the correct sequence. Option C is incorrect
because the reservoir follows the agent, not the reverse. Option D is incorrect
because the susceptible host is the final link, not the first.
Question 5
A public health nurse is teaching a community group about herd immunity. Which
statement by a participant indicates a need for further teaching?
A. "Herd immunity protects those who cannot be vaccinated."
B. "Herd immunity requires a certain proportion of the population to be
immune."
C. "Herd immunity means I don't need to vaccinate my child."
D. "Vaccination helps achieve herd immunity."
Correct answer: C
RATIONALE: Herd immunity relies on a sufficient proportion of the population
being immune, which is achieved through vaccination. Individuals should still be
vaccinated because herd immunity does not guarantee protection for every
unvaccinated person, and vaccine-preventable diseases can still circulate. Option
A is correct because herd immunity provides indirect protection to those who
cannot be vaccinated. Option B is correct because a threshold proportion is
required. Option D is correct because vaccination is the primary means of
achieving herd immunity.
Question 6
OBJECTIVE ASSESSMENT V1 | 150 QUESTIONS AND
CORRECT ANSWERS WITH RATIONALES | HLTH 3600 |
2026 UPDATED
CORE DOMAINS
• Foundations of Chronic and Infectious Disease
• Epidemiology and Disease Measurement
• Chain of Infection and Transmission
• Immunity, Vaccination, and Herd Immunity
• Chronic Disease Pathophysiology and Risk Factors
• Infectious Disease Pathophysiology and Virulence
• Prevention Strategies Across the Lifespan
• Social Determinants of Health and Health Equity
• Emerging and Re-emerging Infectious Diseases
• Antimicrobial Resistance and Stewardship
• Public Health Surveillance and Reporting
• Disease Management and Patient Education
Purpose of the Exam
This comprehensive examination assesses the student's mastery of chronic and
infectious disease concepts essential for population health and clinical practice. It
evaluates competence in applying epidemiological principles, understanding
disease transmission and prevention, analyzing risk factors for chronic conditions,
and implementing evidence-based interventions. The multiple-choice and
scenario-based structure emphasizes real-world application, clinical decision-
,making, and the integration of public health and patient-centered care. Successful
performance demonstrates readiness to analyze disease patterns, educate
patients and communities, and contribute to disease prevention and management
efforts.
SECTION ONE: QUESTIONS 1–150
Question 1
A public health nurse is analyzing disease patterns in a community. The nurse
notes that a disease has a low incidence but a long duration. Which measure best
reflects the burden of this chronic illness in the community?
A. Incidence rate
B. Prevalence rate
C. Mortality rate
D. Case fatality rate
Correct answer: B
RATIONALE: Prevalence measures the total number of existing cases (new and
old) in a population at a given time, making it the best measure of disease burden
for chronic conditions with long duration. Option A, incidence, measures only new
cases and does not reflect the total burden. Option C, mortality, measures deaths,
not the number of people living with the disease. Option D, case fatality,
measures the proportion of diagnosed cases that die, not the overall burden of
illness in the population.
Question 2
A nurse is educating a patient about the difference between chronic and acute
diseases. Which statement by the patient indicates correct understanding?
A. "Chronic diseases always resolve with treatment."
B. "Acute diseases develop gradually over many years."
C. "Chronic diseases are long-term and often require ongoing management."
,D. "Acute diseases are never life-threatening."
Correct answer: C
RATIONALE: Chronic diseases are characterized by long duration, slow
progression, and the need for ongoing management. Option A is incorrect
because chronic diseases typically cannot be cured. Option B is incorrect because
acute diseases have a sudden onset. Option D is incorrect because acute diseases
such as myocardial infarction and sepsis can be life-threatening.
Question 3
A community health nurse is investigating an outbreak of hepatitis A. Which of
the following is the most likely mode of transmission?
A. Airborne
B. Bloodborne
C. Fecal-oral
D. Vector-borne
Correct answer: C
RATIONALE: Hepatitis A is transmitted through the fecal-oral route, often via
contaminated food or water. Option A is incorrect because hepatitis A is not
airborne. Option B is incorrect because hepatitis A is not primarily bloodborne;
hepatitis B and C are transmitted through blood. Option D is incorrect because
hepatitis A is not vector-borne.
Question 4
A nurse is reviewing the chain of infection model. Which of the following
represents the correct sequence?
A. Portal of entry, susceptible host, causative agent, reservoir, portal of exit,
mode of transmission
B. Causative agent, reservoir, portal of exit, mode of transmission, portal of entry,
susceptible host
, C. Reservoir, causative agent, portal of entry, mode of transmission, portal of exit,
susceptible host
D. Susceptible host, causative agent, reservoir, mode of transmission, portal of
exit, portal of entry
Correct answer: B
RATIONALE: The chain of infection is: causative agent → reservoir → portal of
exit → mode of transmission → portal of entry → susceptible host. Option A is
incorrect because it does not follow the correct sequence. Option C is incorrect
because the reservoir follows the agent, not the reverse. Option D is incorrect
because the susceptible host is the final link, not the first.
Question 5
A public health nurse is teaching a community group about herd immunity. Which
statement by a participant indicates a need for further teaching?
A. "Herd immunity protects those who cannot be vaccinated."
B. "Herd immunity requires a certain proportion of the population to be
immune."
C. "Herd immunity means I don't need to vaccinate my child."
D. "Vaccination helps achieve herd immunity."
Correct answer: C
RATIONALE: Herd immunity relies on a sufficient proportion of the population
being immune, which is achieved through vaccination. Individuals should still be
vaccinated because herd immunity does not guarantee protection for every
unvaccinated person, and vaccine-preventable diseases can still circulate. Option
A is correct because herd immunity provides indirect protection to those who
cannot be vaccinated. Option B is correct because a threshold proportion is
required. Option D is correct because vaccination is the primary means of
achieving herd immunity.
Question 6
