ATI Community Health Nursing Proctored Focus Study Guide
Actual Exam 2026/2027 | Detailed Rationales | Graded A+ | Pass
Guaranteed – A+ Graded
Section 1: Epidemiology & Disease Surveillance
Question 1
A community health nurse is reviewing data from the local health department. Over the
past year, 150 new cases of tuberculosis were diagnosed in a city of 500,000 residents.
Which term best describes this measure?
A. Prevalence
B. Incidence
C. Mortality rate
D. Attack rate
Correct Answer: B. Incidence
Rationale: Incidence measures the number of new cases of a disease in a population
over a specified period. Prevalence includes both new and existing cases. Mortality rate
measures deaths, and attack rate is a type of incidence used during outbreaks in
defined populations over a short period.
Question 2
During an outbreak investigation of foodborne illness at a local restaurant, the nurse
identifies that 45 of 90 patrons who ate the Caesar salad became ill, while 10 of 110
patrons who did not eat the salad became ill. Which epidemiologic measure should the
nurse calculate next?
,A. Case fatality rate
B. Relative risk
C. Odds ratio
D. Sensitivity
Correct Answer: B. Relative risk
Rationale: Relative risk compares the risk of disease in the exposed group (45/90 =
0.50) to the risk in the unexposed group (10/110 = 0.09). This is appropriate for a cohort
study design where exposure status is known. Odds ratio is used in case-control
studies. Case fatality rate measures deaths among cases, and sensitivity is a screening
test characteristic.
Question 3
A public health nurse is planning a primary prevention program for type 2 diabetes in a
community with high obesity rates. According to the levels of prevention, which
intervention represents primary prevention?
A. Screening adults for elevated fasting blood glucose
B. Teaching healthy eating and exercise to at-risk adolescents
C. Providing insulin management education to newly diagnosed clients
D. Conducting foot assessments for clients with diabetic neuropathy
Correct Answer: B. Teaching healthy eating and exercise to at-risk adolescents
Rationale: Primary prevention aims to prevent disease before it occurs through health
promotion and specific protection. Screening (A) is secondary prevention. Insulin
management education (C) and foot assessments (D) are tertiary prevention
interventions for those already diagnosed.
Question 4
,The epidemiologic triangle consists of three components. Which of the following
correctly identifies these three components?
A. Host, environment, and vector
B. Agent, host, and environment
C. Time, place, and person
D. Susceptibility, exposure, and outcome
Correct Answer: B. Agent, host, and environment
Rationale: The epidemiologic triangle (triad) consists of the agent (cause of disease),
host (organism harboring the disease), and environment (external factors). Vectors may
be part of the environment but are not one of the three core components. Time, place,
and person are used in descriptive epidemiology.
Question 5
A community health nurse is investigating an outbreak of Legionnaires' disease at a
hotel. The nurse creates a histogram showing the number of cases by date of symptom
onset. What is this epidemiologic tool called?
A. Epidemic curve
B. Scatter plot
C. Case-control study
D. Cohort analysis
Correct Answer: A. Epidemic curve
Rationale: An epidemic curve (epi curve) is a histogram that displays cases of disease
by date of onset. It helps identify the pattern of spread, incubation period, and possible
exposure period. Scatter plots show relationships between two continuous variables,
while case-control and cohort are study designs, not visual tools.
Question 6
, A nurse is analyzing morbidity data for a community. Which statement accurately
describes the difference between morbidity and mortality?
A. Morbidity refers to deaths in a population; mortality refers to illness in a population
B. Morbidity refers to illness in a population; mortality refers to deaths in a population
C. Morbidity and mortality are synonymous terms for disease incidence
D. Morbidity measures only chronic disease, while mortality measures only acute
disease
Correct Answer: B. Morbidity refers to illness in a population; mortality refers to deaths
in a population
Rationale: Morbidity refers to the state of being diseased or the incidence of disease in
a population. Mortality refers to the incidence of death in a population. These are
distinct epidemiologic measures used to assess population health status.
Question 7
A community health nurse is implementing a screening program for hypertension.
Which statistical measure indicates the proportion of true positives among all
individuals who actually have the disease?
A. Sensitivity
B. Specificity
C. Positive predictive value
D. Negative predictive value
Correct Answer: A. Sensitivity
Rationale: Sensitivity is the proportion of individuals with the disease who test positive
(true positives / all diseased). Specificity measures true negatives among those without
disease. Positive predictive value measures the probability of disease among those who
test positive. Negative predictive value measures the probability of no disease among
those who test negative.
Actual Exam 2026/2027 | Detailed Rationales | Graded A+ | Pass
Guaranteed – A+ Graded
Section 1: Epidemiology & Disease Surveillance
Question 1
A community health nurse is reviewing data from the local health department. Over the
past year, 150 new cases of tuberculosis were diagnosed in a city of 500,000 residents.
Which term best describes this measure?
A. Prevalence
B. Incidence
C. Mortality rate
D. Attack rate
Correct Answer: B. Incidence
Rationale: Incidence measures the number of new cases of a disease in a population
over a specified period. Prevalence includes both new and existing cases. Mortality rate
measures deaths, and attack rate is a type of incidence used during outbreaks in
defined populations over a short period.
Question 2
During an outbreak investigation of foodborne illness at a local restaurant, the nurse
identifies that 45 of 90 patrons who ate the Caesar salad became ill, while 10 of 110
patrons who did not eat the salad became ill. Which epidemiologic measure should the
nurse calculate next?
,A. Case fatality rate
B. Relative risk
C. Odds ratio
D. Sensitivity
Correct Answer: B. Relative risk
Rationale: Relative risk compares the risk of disease in the exposed group (45/90 =
0.50) to the risk in the unexposed group (10/110 = 0.09). This is appropriate for a cohort
study design where exposure status is known. Odds ratio is used in case-control
studies. Case fatality rate measures deaths among cases, and sensitivity is a screening
test characteristic.
Question 3
A public health nurse is planning a primary prevention program for type 2 diabetes in a
community with high obesity rates. According to the levels of prevention, which
intervention represents primary prevention?
A. Screening adults for elevated fasting blood glucose
B. Teaching healthy eating and exercise to at-risk adolescents
C. Providing insulin management education to newly diagnosed clients
D. Conducting foot assessments for clients with diabetic neuropathy
Correct Answer: B. Teaching healthy eating and exercise to at-risk adolescents
Rationale: Primary prevention aims to prevent disease before it occurs through health
promotion and specific protection. Screening (A) is secondary prevention. Insulin
management education (C) and foot assessments (D) are tertiary prevention
interventions for those already diagnosed.
Question 4
,The epidemiologic triangle consists of three components. Which of the following
correctly identifies these three components?
A. Host, environment, and vector
B. Agent, host, and environment
C. Time, place, and person
D. Susceptibility, exposure, and outcome
Correct Answer: B. Agent, host, and environment
Rationale: The epidemiologic triangle (triad) consists of the agent (cause of disease),
host (organism harboring the disease), and environment (external factors). Vectors may
be part of the environment but are not one of the three core components. Time, place,
and person are used in descriptive epidemiology.
Question 5
A community health nurse is investigating an outbreak of Legionnaires' disease at a
hotel. The nurse creates a histogram showing the number of cases by date of symptom
onset. What is this epidemiologic tool called?
A. Epidemic curve
B. Scatter plot
C. Case-control study
D. Cohort analysis
Correct Answer: A. Epidemic curve
Rationale: An epidemic curve (epi curve) is a histogram that displays cases of disease
by date of onset. It helps identify the pattern of spread, incubation period, and possible
exposure period. Scatter plots show relationships between two continuous variables,
while case-control and cohort are study designs, not visual tools.
Question 6
, A nurse is analyzing morbidity data for a community. Which statement accurately
describes the difference between morbidity and mortality?
A. Morbidity refers to deaths in a population; mortality refers to illness in a population
B. Morbidity refers to illness in a population; mortality refers to deaths in a population
C. Morbidity and mortality are synonymous terms for disease incidence
D. Morbidity measures only chronic disease, while mortality measures only acute
disease
Correct Answer: B. Morbidity refers to illness in a population; mortality refers to deaths
in a population
Rationale: Morbidity refers to the state of being diseased or the incidence of disease in
a population. Mortality refers to the incidence of death in a population. These are
distinct epidemiologic measures used to assess population health status.
Question 7
A community health nurse is implementing a screening program for hypertension.
Which statistical measure indicates the proportion of true positives among all
individuals who actually have the disease?
A. Sensitivity
B. Specificity
C. Positive predictive value
D. Negative predictive value
Correct Answer: A. Sensitivity
Rationale: Sensitivity is the proportion of individuals with the disease who test positive
(true positives / all diseased). Specificity measures true negatives among those without
disease. Positive predictive value measures the probability of disease among those who
test positive. Negative predictive value measures the probability of no disease among
those who test negative.
