Answer: D. Population health. Public health works to protect and improve health across populations through prevention, protection, promotion, and organized community action.
Which phrase best captures a core public health mission?
A Replace all clinical care
B Prevent disease and promote health
C Treat illness after complications
D Focus only on hospitals
Answer: B. Prevent disease and promote health. Public health aims to prevent disease, prolong life, and promote health through organized efforts across society.
During a one-year study, what does incidence count?
A All historical cases
B Deaths from every cause
C New cases
D People already recovered
Answer: C. New cases. Incidence measures new cases arising during a specified time among a defined population at risk.
Which measure counts everyone living with a condition at a point or period?
A Prevalence
B Case fatality
C Incidence
D Exposure rate
Answer: A. Prevalence. Prevalence describes existing cases in a population at a particular time or over a defined period.
How does epidemiology help public health teams?
A Set individual diagnoses
B Find health patterns and causes
C Guarantee prevention success
D Replace laboratory testing
Answer: B. Find health patterns and causes. Epidemiology studies the distribution and determinants of health events in populations and applies findings to control health problems.
What makes health surveillance useful for a community?
A Unverified social media posts
B Ongoing systematic data collection
C Records without analysis
D One-time informal opinions
Answer: B. Ongoing systematic data collection. Public health surveillance systematically collects, analyzes, interprets, and shares health data to guide action.
In passive surveillance, how are case reports usually gathered?
A Random household inspections
B Routine reports from providers
C Daily patient interviews by investigators
D Door-to-door case searches
Answer: B. Routine reports from providers. Passive surveillance typically relies on health facilities or laboratories submitting routine reports to public health authorities.
What distinguishes active surveillance from passive reporting?
A Only annual summaries are used
B Health officials seek cases
C Providers send routine reports
D No case definitions apply
Answer: B. Health officials seek cases. Active surveillance involves public health personnel proactively contacting sources or searching records to identify cases.
Why might a health authority use sentinel surveillance?
A All residents are examined
B It replaces outbreak investigation
C Every case is guaranteed
D Selected sites track trends
Answer: D. Selected sites track trends. Sentinel systems use selected facilities or populations to monitor trends efficiently; they do not necessarily capture every case.
When do investigators generally describe an unusual increase as an outbreak?
A A survey is completed
B Any single case appears
C Cases fall below baseline
D Cases exceed expected levels
Answer: D. Cases exceed expected levels. An outbreak is an increase in cases above what is normally expected in a defined place and time; definitions vary by disease and context.
What does endemic disease presence describe?
A Usual presence in an area
B Worldwide spread at once
C Complete absence of disease
D A sudden isolated cluster
Answer: A. Usual presence in an area. Endemic describes the usual presence or baseline occurrence of a disease within a particular geographic area or population.
Which situation best fits the term pandemic?
A A steady local baseline
B A single imported case
C One clinic’s small cluster
D Wide spread across countries
Answer: D. Wide spread across countries. A pandemic is an epidemic that has spread across countries or continents and affects a large number of people.
Which three components form the classic epidemiologic triad?
A Test, treatment, recovery
B Agent, host, environment
C Policy, budget, workforce
D Person, place, time
Answer: B. Agent, host, environment. The epidemiologic triad describes interactions among an agent, a susceptible host, and the environment that enables exposure or transmission.
In the chain of infection, why target a transmission link?
A Remove all disease records
B Increase host susceptibility
C Interrupt spread of infection
D Extend infectious periods
Answer: C. Interrupt spread of infection. Infection-control measures can prevent spread by interrupting one or more links in the chain of infection.
After identifying an infectious case, what is a purpose of contact tracing?
A Identify potentially exposed people
B Guarantee nobody becomes ill
C Publish names publicly
D Replace laboratory confirmation
Answer: A. Identify potentially exposed people. Contact tracing identifies people who may have been exposed so health teams can provide appropriate information, testing, or follow-up under local guidance.
Which example represents primary prevention?
A Detecting disease early
B Preventing disease before onset
C Managing long-term complications
D Restoring function after injury
Answer: B. Preventing disease before onset. Primary prevention acts before disease or injury occurs, such as through immunization, safer environments, or risk reduction.
When a screening program finds disease before symptoms appear, which prevention level is this?
A Secondary prevention
B Primordial prevention
C Primary prevention
D Tertiary prevention
Answer: A. Secondary prevention. Secondary prevention aims to detect disease early and intervene promptly, often before symptoms become apparent.
Rehabilitation after a stroke mainly illustrates which prevention level?
A Tertiary prevention
B Secondary prevention
C Primordial prevention
D Primary prevention
Answer: A. Tertiary prevention. Tertiary prevention reduces disability and complications and supports function after a disease or injury has occurred.
For whom are screening tests generally intended?
A People without symptoms
B Only confirmed patients
C People needing rehabilitation
D Only emergency cases
Answer: A. People without symptoms. Screening usually seeks possible disease among people who do not yet have symptoms, with diagnostic assessment following a positive result.
What should happen after a positive screening result?
A Follow-up diagnostic assessment
B Stop all further evaluation
C Immediate public labeling
D Assume disease is confirmed
Answer: A. Follow-up diagnostic assessment. A positive screening result indicates a need for further assessment; it does not by itself establish a diagnosis.
Why does a positive screening result not confirm a diagnosis?
A Excluding all healthy people
B Measuring treatment adherence
C Detecting most true cases
D Confirming every positive result
Answer: C. Detecting most true cases. Sensitivity is the proportion of people with a condition who test positive; higher sensitivity means fewer false negatives.
What does a test’s specificity measure?
A Predicting future exposure
B Detecting every true case
C Correctly identifying people without disease
D Counting new cases over time
Answer: C. Correctly identifying people without disease. Specificity is the proportion of people without a condition who test negative; higher specificity means fewer false positives.
Among people with positive results, what does positive predictive value describe?
A Healthy people testing negative
B Share of all cases detected
C Number of tests performed
D Share who truly have disease
Answer: D. Share who truly have disease. Positive predictive value is the probability that a person with a positive result truly has the condition; it depends partly on prevalence.
If a healthy person receives a positive test result, how is it classified?
A True negative
B False negative
C True positive
D False positive
Answer: D. False positive. A false positive occurs when a test result is positive even though the person does not have the condition.
Which factor is a social determinant of health?
A Blood type alone
B One laboratory result
C Access to safe housing
D A clinic’s logo
Answer: C. Access to safe housing. Social determinants are conditions in which people are born, grow, live, work, and age, including housing, education, income, and access to resources.
How does health equity guide public health action?
A Give identical support always
B Address avoidable unfair differences
C Restrict services by income
D Focus only on averages
Answer: B. Address avoidable unfair differences. Health equity seeks the highest attainable health for all and gives attention to unfair, avoidable differences and barriers.
What is the purpose of health promotion?
A Enable people to improve health
B Limit community participation
C Replace disease treatment
D Focus only on health messaging
Answer: A. Enable people to improve health. WHO describes health promotion as enabling people to increase control over and improve their health.
Which ability is part of health literacy?
A Interpret scans without training
B Prescribe medicines independently
C Memorize every medical term
D Find, understand, use health information
Answer: D. Find, understand, use health information. Health literacy includes finding, understanding, and using health information and services to make decisions.
During an emerging outbreak, what makes risk communication effective?
A Delayed, technical statements
B One message for every audience
C Timely, clear, trusted information
D Unverified claims without context
Answer: C. Timely, clear, trusted information. Effective risk communication shares timely, accurate, understandable information and practical actions through trusted channels.
What does meaningful community engagement involve?
A One-way instructions only
B Consultation after decisions
C Publicity without feedback
D Communities help shape decisions
Answer: D. Communities help shape decisions. Community engagement treats people as partners in identifying needs and designing, delivering, and evaluating relevant health actions.
Which description best fits primary health care?
A A single screening service
B Emergency treatment alone
C Hospital care only
D Integrated, community-centered health approach
Answer: D. Integrated, community-centered health approach. Primary health care combines integrated services, action on broader determinants, and empowerment of people and communities.
Why do referral pathways matter in primary health care?
A Avoid follow-up after referral
B Support coordinated continuing care
C Replace community services
D Keep cases at one level
Answer: B. Support coordinated continuing care. Clear referral and follow-up links connect primary care with higher levels when needed and reduce fragmented care.
What does universal health coverage aim to ensure?
A Free care for every procedure
B Only hospital-based treatment
C Identical services everywhere
D Needed services without financial hardship
Answer: D. Needed services without financial hardship. Universal health coverage means people can access needed quality services without financial hardship.
What does intersectoral public health action mean?
A Hospitals set every policy
B Sectors work together on health
C Communities avoid planning
D Health agencies act alone
Answer: B. Sectors work together on health. Many health determinants lie beyond health services, so collaboration across sectors can address shared causes and conditions.
Which action most directly supports environmental health?
A Increase avoidable pollution
B Ignore unsafe housing
C Reduce harmful environmental exposures
D Remove routine health monitoring
Answer: C. Reduce harmful environmental exposures. Environmental health addresses physical, chemical, and biological factors in surroundings that can affect health.
How can safe water and sanitation protect population health?
A Eliminate need for surveillance
B Prevent every chronic illness
C Reduce exposure to pathogens
D Replace all vaccinations
Answer: C. Reduce exposure to pathogens. Safe water and sanitation reduce exposure to infectious hazards and support healthier living conditions.
What is a public health goal of workplace safety programs?
A Monitor only after retirement
B Replace worker training
C Increase hazardous exposures
D Prevent work-related illness and injury
Answer: D. Prevent work-related illness and injury. Occupational health protects workers by preventing illness and injury and by improving workplace conditions.
Which issue is suited to a One Health approach?
A A single clinic’s staffing
B Human, animal, ecosystem health links
C Hospital accounting alone
D Individual exercise planning
Answer: B. Human, animal, ecosystem health links. One Health recognizes that human, animal, plant, and ecosystem health are interconnected and calls for cross-sector collaboration.
Why is antimicrobial resistance a public health concern?
A Only animal health is affected
B Infections become harder to treat
C All microbes disappear
D Medicines become universally effective
Answer: B. Infections become harder to treat. Antimicrobial resistance can make infections harder to treat and requires coordinated action across human, animal, and environmental health.
How does routine immunization contribute to public health?
A Prevents vaccine-preventable disease
B Guarantees zero disease risk
C Replaces all health services
D Treats every existing infection
Answer: A. Prevents vaccine-preventable disease. Immunization helps prevent specified infectious diseases and can reduce illness and transmission at population level.
Which activity fits the assessment function in public health?
A Monitor community health needs
B Provide all clinical care
C Set hospital prices
D Draft every law
Answer: A. Monitor community health needs. Assessment includes monitoring population health, factors that influence it, and community needs and assets.
Which task is an example of policy development for public health?
A Maintain a lab instrument
B Treat one patient
C Collect raw data only
D Create evidence-informed health policies
Answer: D. Create evidence-informed health policies. Policy development includes creating and implementing policies, plans, and laws that can affect population health.
What does public health assurance include?
A Writing policy proposals only
B Publishing research alone
C Equitable access to needed services
D Monitoring trends only
Answer: C. Equitable access to needed services. Assurance includes enabling equitable access to services and supporting a competent workforce and effective public health systems.
Why do communities prepare for health emergencies?
A Improve readiness and response
B Guarantee hazards never occur
C Replace routine prevention
D Stop all public communication
Answer: A. Improve readiness and response. Preparedness builds capacity to anticipate, respond to, and recover from emergencies while maintaining essential services.
What is a useful first step in a community health needs assessment?
A Use one person’s opinion
B Choose a program immediately
C Review data and community assets
D Ignore local priorities
Answer: C. Review data and community assets. Needs assessment combines relevant population data with community knowledge and assets to identify priorities.
When a team tracks whether planned workshops were delivered, what kind of indicator is this?
A Process indicator
B Outcome indicator
C Disease prevalence
D Impact estimate
Answer: A. Process indicator. Process indicators measure whether program activities were carried out as intended.
After a health program, which measure is an outcome indicator?
A Number of leaflets printed
B Change in health behavior
C Training sessions scheduled
D Staff meeting attendance
Answer: B. Change in health behavior. Outcome indicators assess changes associated with a program, such as knowledge, behavior, or health status.
Why evaluate a public health program?
A Improve decisions and effectiveness
B Replace community feedback
C Guarantee every target is met
D Avoid collecting evidence
Answer: A. Improve decisions and effectiveness. Evaluation helps determine whether programs are implemented as intended and whether they achieve useful results.
In an observational study, what can confounding do?
A Prove direct causation
B Remove selection bias automatically
C Distort an exposure-outcome association
D Guarantee accurate measurement
Answer: C. Distort an exposure-outcome association. A confounder is associated with both an exposure and outcome and can distort their observed relationship if not addressed.
How should identifiable public health data be handled?
A Keep data without safeguards
B Use records for unrelated purposes
C Limit access and protect privacy
D Share names publicly
Answer: C. Limit access and protect privacy. Public health data should be handled with safeguards, limited access, and respect for applicable privacy rules and public health duties.