notes SG
1. Risk Factor Phase vs. Sanitary Phase
Sanitary Phase
Definition: An early phase of epidemiology based on the belief that diseases stem from environmental contamination and "bad air" or miasma.
Focus: Improving sanitation and environmental conditions rather than individual behaviors.
Major Reforms:
Clean water systems
Sewage disposal
Ventilation
Sanitation infrastructure
Safer housing
Context: Gained significance during urbanization and the Industrial Revolution, addressing issues such as overcrowding, water contamination, and poor sanitation that led to infectious diseases.
Risk Factor Phase
Definition: A later phase that emerged after infectious disease rates dropped and life expectancy increased.
Focus: Shifted attention to chronic diseases and the characteristics or exposures that raise illness likelihood.
Examples of Risk Factors:
Smoking
Poor diet
Physical inactivity
Alcohol use
Unsafe housing
Contaminated water
Genetic susceptibility
Focus of Epidemiology: Began to ask which specific exposures or behaviors increased disease risk.
Main Differences
Sanitary Phase: Environmental cleanup and public infrastructure aimed at disease reduction.
Risk Factor Phase: Identification of behaviors, exposures, and traits linked to disease risk.
Exam Note
The sanitary phase concentrated on rectifying unhealthy environments while the risk factor phase emphasized identifying measurable risks for diseases, particularly chronic diseases.
2. John Snow’s Importance to Epidemiology
Significance: John Snow is known as the founder of modern epidemiology.
Contributions:
Mapped cholera deaths in London.
Identified clusters of cholera cases.
Linked the outbreak to a contaminated Broad Street water pump.
Impact: His work showcased that disease could be studied scientifically through analyzing patterns in populations rather than individual cases.
Key Takeaways
Helped advance epidemiological methods by:
Analyzing who got sick.
Determining where illness occurred.
Identifying sources of illness.
Utilizing evidence to drive public health actions.
Provided a framework for public health interventions by altering systems, not merely treating individuals.
3. Epidemiological Study Types
Cross-Sectional Study
Description: Measures disease and exposure at a single time point (also known as a prevalence study).
Utility: Describes the current burden of disease but does not establish the temporal sequence of exposure and disease.
Case-Control Study
Comparison:
Cases: Individuals with the disease.
Controls: Individuals without the disease.
Directionality: Typically retrospective, looking back to identify previous exposures.
Key Measure: Odds Ratio (OR).
Usefulness: Effective for studying rare diseases or diseases requiring extended development periods.
Cohort Study
Definition: Follows groups over time to compare disease development between exposed and unexposed groups.
Types: Can be prospective or retrospective.
Key Measure: Relative Risk (RR).
Strength: Strong for demonstrating a temporal sequence as it establishes exposure before the outcome.
Outbreak Investigation
Definition: A structured public health response when disease levels exceed expected occurrence.
Characteristics:
Aspects examined include who got sick, what caused the illness, when it occurred, where transmission happened, and how the disease spread.
Nature: Not merely an academic study, but an applied public health response.
Comparative Summary
Cross-Sectional: Snapshot of disease and exposure at one moment.
Case-Control: Starts with disease, looks backwards.
Cohort: Starts with exposure, follows forward.
Outbreak Investigation: Rapid applied framework for identifying source and halting spread.
4. Communicable vs. Noncommunicable Disease
Communicable Disease
Definition: An infection caused by pathogenic microorganisms that can spread directly or indirectly from one person to another.
Examples:
Influenza
Tuberculosis (TB)
HIV/AIDS
COVID-19
Sexually transmitted infections (STIs)
Implications: Major contributors to morbidity and mortality worldwide; require surveillance, infection control, sanitation, education, and vaccination efforts.
Noncommunicable Disease
Definition: Diseases that are not spread from person to person, usually chronic and linked to risk factors.
Examples:
Heart disease
Diabetes
Cancer
Stroke
Chronic respiratory diseases
Epidemiology Focus: Highlighted in the risk factor phase of epidemiology which emphasizes chronic conditions.
Main Differences
Communicable: Infectious and transmissible.
Noncommunicable: Not infectious; typically chronic and multifactorial, with associations to various risk factors and social determinants of health (SDOH).
5. Social Determinants of Health (SDOH)
Definition: The conditions in which people live, work, learn, and play; non-medical social structures and policies affecting health outcomes.
Examples:
Education
Income
Housing quality
Food access
Transportation
Healthcare access
Experiences of racism
Neighborhood safety
Importance of SDOH
Essential to optimize individual health by understanding the broader community and environmental context.
Impact:
Strong influence on disease risk.
Affects access to healthcare.
Determines exposure to hazards.
Influences usage of preventative services and long-term health outcomes.
Exam Point
Upstream interventions target broader issues such as housing, transportation, and food access.
6. Role/Function of the World Health Organization (WHO)
Overview: Leading global health organization with key responsibilities.
Core Functions:
Setting global health standards.
Coordinating pandemic response efforts.
Guiding disaster response initiatives.
Supporting primary health care systems.
Overseeing International Health Regulations (IHR).
Importance of WHO
Coordinates global responses during pandemics, large-scale communicable disease challenges, and supports international sustainability initiatives.
7. Core Functions of Public Health
Core Functions
Assessment
Collects data, analyzes health problems, and monitors community needs.
Example: Tracking COVID-19 case data.
Policy Development
Utilizes evidence to construct public health laws, regulations, and strategies.
Example: Implementing smoking bans and epidemiological impact regulations.
Assurance
Ensures that required services are available, accessible, competent, and effective.
Example: Guaranteeing vaccine availability and preparing competent public health workforces.
Related Concept
Ten Essential Public Health Services: These services operationalize the three core functions. They include monitoring health status, diagnosing and investigating health problems, mobilizing community partnerships, linking people to services, evaluating services, and researching innovative health solutions.
8. Community Capacity
Definition: The ability of community members to:
Work collaboratively.
Organize community assets.
Identify root causes of issues.
Implement viable solutions.
Sustain improvements over time.
Components Reflecting Capacity:
Leadership development
Collaboration
Communication
Participation
Conflict management
Achieving goals
Self-awareness
Importance of Community Capacity
High capacity communities can:
Efficiently respond to health challenges.
Support ongoing interventions.
Sustain public health programs independently when external support ceases.
Vital in program planning for sustainability.
9. Levels of Prevention: Upstream, Midstream, Downstream
Primary Prevention
Definition: Prevents diseases before they occur.
Examples:
Immunizations
Violence prevention strategies
Sanitation efforts
Clean water access
Exercise promotion initiatives
Anti-smoking campaigns.
Secondary Prevention
Definition: Detects diseases early through various means.
Examples:
Health screenings
Mammograms
Blood pressure checks
School health screenings
Outbreak case finding activities.
Tertiary Prevention
Definition: Reduces complications from existing diseases and enhances functioning.
Examples:
Diabetes management plans
Asthma action plans
Emergency episodic care
Rehabilitation programs.
Upstream, Midstream, Downstream Definitions
Upstream: Addresses the root causes through policy changes and environmental strategies.
Midstream: Targets individuals or groups in communities via screening services and health behavior programs.
Downstream: Involves treatment after disease development, addressing acute and chronic care.
Quick Memory Aid
Upstream: Prevent conditions causing illnesses.
Midstream: Catch risks early.
Downstream: Manage illnesses after they arise.
10. Prevalence Pot, Natural History of Disease, and Public Health Interventions
Prevalence
Definition: The total number of existing disease cases in a specific population at a designated time, comprising both new and existing cases.
Prevalence Pot
Concept: Visual representation of individuals currently affected by a disease.
Dynamics:
Cases enter via incidence (new cases).
Leave through: cure, recovery, death, or in some cases, disability or chronicity, depending on how the disease is conceptualized.
Natural History of Disease
Stages:
Susceptibility
Subclinical stage
Clinical stage
Resolution (potential outcomes include cure, chronicity, or death).
Public Health Importance
Application: Public health officials analyze the natural history along with the prevalence pot to determine intervention points:
High incidence suggests the need for primary prevention strategies.
Long subclinical phases favor screening and secondary prevention methods.
Long-term chronic conditions necessitate tertiary prevention plans.
11. Demographics, Biostatistics, and Life Expectancy
Demographics
Definition: The statistical study of population characteristics.
Key Characteristics Studied:
Age
Gender
Race
Income
Education Level
Sources of Data: Can be collected from census data, health department records, surveys, and hospital records.
Biostatistics
Overview: Statistical analysis specifically focused on biological and health data.
Components:
Descriptive statistics
Inferential statistics
Rates
Incidence
Prevalence
Morbidity
Mortality
Percent change.
Life Expectancy
Definition: The average number of years a newborn is expected to live, assuming constant mortality rates.
Significance: Indicator of overall population health; globally increasing, with attention to drops in the U.S. due to COVID-19 and the opioid crisis.
Global Health Disparities
Key Issues: Life expectancy disparities in lower-income countries often relate to:
Vaccine access
Availability of clean water
Poverty levels
Infrastructure quality
Environmental conditions
Global inequalities among LIC/LMIC and HIC/UMIC nations.
12. Assessment Types
Comprehensive Community Assessment
Scope: Evaluates the entire community encompassing:
Demographics
Resources
Disparities
Infrastructure
Overall public health footprint.
Rapid Needs Assessment (RNA)
Description: Fast assessment implemented in disasters/emergencies to pinpoint immediate needs and allocate resources.
Associations: Linked with CDC, FEMA, USPHS, and CASPER.
Population-Focused Assessment
Target: Specific subgroups such as:
Disease groups
Age groups
Ethnic groups
High-risk populations.
Health Impact Assessment (HIA)
Purpose: Evaluates health impacts of proposed projects or policies before implementation.
Stages:
Screening
Scoping
Appraisal
Reporting
Monitoring.
Core Values: Democracy, equity, sustainability, and ethical evidence use.
13. Needs Assessment vs. Asset Mapping
Needs Assessment
Focus: Identifies deficits by establishing the gap between what exists and what should be.
Areas of Emphasis: Looks for unmet needs, problems, and service deficits.
Asset Mapping
Focus: Highlights strengths present within the community, emphasizing available resources such as:
People
Places
Systems.
Key Distinction for Exams
Needs Assessment: Asks about existing problems and gaps.
Asset Mapping: Questions what strengths and resources are currently available.
Comprehensive Community Health Assessments (CHA): Ideally incorporate both approaches.
14. CHANGE Model in Public Health Nursing
Definition: The CHANGE model is a community assessment tool devised by the CDC that applies the socioecological model.
Key Focus Areas:
Policy change
Systems transformation
Environmental improvements.
Five Sectors Assessed
Community-at-large
Community institutions and organizations
Healthcare sector
School sector
Worksite sector.
Eight Steps of Implementation
Assemble the team.
Develop strategy.
Review assessed sectors.
Gather and analyze data.
Review and evaluate data.
Enter data into systems.
Consolidate findings.
Build and execute an action plan.
Importance in Public Health Nursing
The CHANGE model offers nurses a structured approach to collecting data, comparing sectors, identifying systemic issues, and establishing living action plans emphasizing policy and environmental changes.
15. Community-Based Participatory Research (CBPR)
Definition: A collaborative research approach where community members are equal partners in assessment and research processes.
Integrative Nature: Combines professional expertise with community insights.
Core Principles
Shared vision
Shared ownership
Mutual benefits
Trust
Co-learning.
Ethical Considerations
Power imbalances.
Participant consent issues.
Fair representation in findings.
Sensitive data-sharing practices.
Steps in Implementation
Build partnerships with community members.
Share power equity.
Identify the community issue collaboratively.
Collect data as a coalition.
Interpret findings together.
Utilize results for actionable solutions and sustainability.
Importance of CBPR
Enhances trust, relevance, cultural sensitivity, and promotes sustainability in interventions over time.
16. Logic Model in Program Design
Definition: A visual representation outlining the planned sequence of a program's implementation and expected outcomes.
Components
Inputs/Resources: Human, financial, physical, and community assets necessary for program execution.
Activities: Actions carried out by the program, such as:
Education sessions
Health screenings
Policy changes
Service delivery.
Outputs: Direct measurable products, such as:
Number of education classes
Number of health screenings conducted.
Outcomes: Changes resulting from the program:
Short-term outcomes (e.g., knowledge increases).
Mid-term outcomes (e.g., behavior changes).
Impact: Long-term health effects such as:
Disease reduction
Mortality reduction
Improving health equity.
Additional Components
Assumptions: Underlying beliefs needed for the logic model’s effectiveness.
External Factors: Influences such as cultural, economic, and demographic factors.
Usage of Logic Model
Employed in program planning, strategy clarification, funding justifications, implementation processes, and evaluations.
Recommended construction is often right to left, beginning with the desired impact, then working backwards to resources.
17. Healthy People 2030 Goals and Purpose
Overview: Healthy People 2030 is the American national health planning framework designed to enhance overall health and well-being through set benchmarks.
Vision
Envisions a society where all people can realize their full health potential throughout their lives.
Purpose
To endorse, enhance, and evaluate health and well-being efforts across communities.
Five Overarching Goals
Reduce preventable diseases and deaths.
Eliminate health disparities among populations.
Improve environments supportive of health.
Promote healthy development throughout life stages.
Foster engagement among leadership across diverse sectors.
Central Themes
Health equity.
Social determinants of health (SDOH).
Health literacy reinforcement.
Creation of healthy environments.
Encouragement of shared responsibility across sectors.
18. Evaluation Types: Formative, Summative, Program, Process
Formative Evaluation
Timing: Conducted during program development or initial implementation phases.
Purpose: Improve performance and capacity of the program before full rollout through fine-tuning.
Summative Evaluation
Process: Done following implementation to assess whether the program meets its goals and outcomes.
Process Evaluation
Focus: Examines implementation fidelity:
Was the program executed as planned?
What was the level of participation?
How extensively was the intervention delivered?
Program Evaluation
Scope: Comprehensive assessment that evaluates effectiveness, efficiency, sustainability, and value of the program to support funding, legislative decisions, and improvement tasks.
19. Epidemiological Triangle
Components
Agent: The disease-causing factor (e.g., influenza virus, SAR-CoV-2).
Host: The susceptible individual (e.g., an elderly person with compromised immune status).
Environment: External conditions promoting disease occurrences (e.g., poor ventilation, crowded conditions).
Example
Influenza:
Agent: Influenza virus.
Host: An elderly adult.
Environment: Crowded indoor settings during winter.
20. Transmission Cycle of Communicable Disease
Chain of Infection includes:
Infectious agent
Reservoir of pathogen
Portal of exit from the reservoir
Mode of transmission
Portal of entry into a new host
Susceptible host
Key Concept
Interrupting any link in the chain can avert disease transmission through measures such as:
Hand hygiene
Use of Personal Protective Equipment (PPE)
Vaccination strategies
Isolation techniques.
21. Modes of Transmission for Diseases
Types and Examples:
Airborne: TB.
Droplet: Influenza.
Foodborne: E. coli.
Waterborne: Cholera.
Vector-borne: Malaria via mosquitoes.
Fomite: Contaminated surfaces.
Person-to-Person/Sexual Contact: STIs such as chlamydia, gonorrhea, syphilis, HIV.
22. Outbreak Investigation Steps
Process:
Identify who was affected.
What caused the illness?
Determine the timing of exposure.
Explore where transmission took place.
Understand how the disease was spread.
Tools Utilized
Tools Include:
Case definitions for identifying cases.
Epidemic curves to visualize outbreaks.
Surveillance data for trends.
Interviews with affected individuals and community members.
Usefulness of Framework
The systematic framework aids public health professionals in:
Identifying sources of outbreaks.
Understanding transmission dynamics.
Halting further spread of disease.
Guiding policy and public control measures to address communicable disease challenges.
23. Key Epidemiological Definitions
Epidemic Curve
Definition: A graphical representation illustrating cases by their time of onset, aiding in visualization of outbreak patterns and timings.
Epidemic Threshold
Definition: The level indicating that the occurrence of disease is significantly above expected levels, often triggering an outbreak investigation.
Attack Rate
Definition: A measure of disease occurrence expressed as:
Point Source
Description: An outbreak scenario in which individuals are exposed to the same source within a defined time frame.
Ecological Fallacy
Definition: The incorrect assumption that community-level findings can be directly attributed to individuals within that community.
Causality
Discussion: Investigates if a cause-and-effect relationship is valid, emphasizing that correlation does not imply causation.
Key Guidelines: Includes criteria such as temporality, strength, consistency, plausibility, and dose-response relationships.
24. Role of School Nursing in Practice Standards
Definition: Specialized nursing field that advocates for student health and wellness, promotes health education, and supports academic success.
Roles and Responsibilities
Key Functions:
Bridge between healthcare and educational entities.
Promote preventative health measures and health literacy.
Coordination of care services.
Advocacy for students and their health needs.
Collaboration with school personnel, families, and community members.
Care Provided
Involves:
Individualized care for students.
Population-based health promotion initiatives.
Preventive care strategies.
Management of chronic diseases.
Emergency health interventions.
Nursing Process Framework
Based on:
Assessment
Diagnosis
Outcome identification
Planning
Implementation
Evaluation.
25. Whole School, Whole Community, Whole Child (WSCC) Intent
Purpose: Integrates education with community health services to ensure students are healthy, safe, supported, and ready to engage in learning.
Core Principle: Emphasizes the intersection of health promotion, disease prevention, care coordination, and collaborative partnerships across schools, families, and community environments.
26. Population-Based School Nursing Practices
Levels of Prevention
Primary Prevention: Prevents illnesses/injuries before they occur.
Examples: Immunizations, health education, preventative health measures.
Secondary Prevention: Identifies and addresses illnesses early through screenings and testing.
Examples: Health screenings, contact tracing during outbreaks.
Tertiary Prevention: Provides care for students already living with chronic conditions to mitigate complications.
Examples: Management plans for diabetes, asthma management, and emergency care strategies.
Comprehensive Overview
Essence of Population-Based Nursing: Encompasses not only direct care to individual students but also systematic approaches to health promotion and disease management for entire student populations, particularly targeting high-risk demographics.
27. Community Diagnosis and Qualitative Data Collection
Community Diagnosis
Definition: A problem statement that captures population-level health issues based on assessments, identifying affected populations and contributing factors.
Importance: Classifies important issues rather than relying solely on medical diagnoses.
Qualitative Data Collection Methods
Methods Include:
Engaging key informants.
Conducting focus groups.
Administering surveys.
Conducting interviews.
Utilizing methods such as PhotoVoice and windshield surveys.
Key Informants and Their Role
Definition: Trusted, knowledgeable community members who provide insight into community health conditions (e.g., local pastors, physicians, health organizers).
28. Incidence Proportion (Attack Rate) Calculation
Formula:
Example Calculation
If 15 out of 300 individuals in a population become ill:
Calculation steps:
Compute new cases:
Multiply by 1,000 to express per 1,000 individuals:
Context of Use
Apply this framework for determining the occurrence of new cases in specified populations, ensuring the denominator correctly reflects the risk population.
29. Percent Change and Its Value
Formula:
Significance of Calculation
Why It’s Valuable: Percent change helps indicate whether a public health problem is escalating or declining over time, informative for:
Trend analysis
Evaluating intervention success
Comparative analysis of population health metrics.
30. Active vs. Passive Surveillance\n
Passive Surveillance
Definition: Reports made by providers or hospitals, often on a voluntary or legally mandated basis.
Example: Hospitals reporting cases of infectious diseases.
Active Surveillance
Definition: Proactive case identification, where public health professionals actively seek out information on disease incidents and trends.
Example: Investigations conducted during an Ebola outbreak.
Comparison of Methods
Passive: Represents routine reporting by health providers.
Active: Involves public health organizations systematically searching for relevant cases.
31. Morbidity vs. Mortality
Definitions:
Morbidity: Refers to the state of being ill or the burden of disease in a population.
Mortality: Indicates the number of deaths occurring in a population.
Quick Distinction
Morbidity = Sickness
Mortality = Death
32. Prevention Types: Universal, Selective, Indicated
Universal Prevention
Definition: Strategies provided to everyone, irrespective of risk accreditations.
Example: Broad public health initiatives such as anti-vaping campaigns, utilizing immunization messaging; considered general prevention.
Selective Prevention
Definition: Targeted toward groups identified as having above-average risk.
Example: Public health outreach in areas with known higher rates of STIs or exposures.
Indicated Prevention
Definition: Direct interventions focusing on individuals exhibiting early signs or risky conduct.
Example: Counseling offered to teenagers experimenting with drugs.
33. Significance of Latency Period
Definition: Time lag between exposure to a hazardous substance and the onset of disease symptoms.
Descriptive Note: The latency period impedes the detection of cause-and-effect connections and makes anticipating preventative actions challenging.
Importance of Latency Period
Challenges include:
Difficulty in correlating exposure with disease.
Complications in identifying the roots of health issues.
Hurdles in establishing early interventions.
Contextual Relevance
Particularly significant for chronic diseases, toxic exposures, and occupational health concerns.
34. Environmental Health History Value
Definition: A detailed individual assessment of environmental exposures concerning time and location.
Components of Assessment:
Exposure survey
Work history
Environmental health history.
Importance of Assessment
Outcomes: It aids practitioners in recognizing hidden exposures, correlating symptoms to environmental sources, identifying workplace/home hazards, and formulating preventative measures and referral pathways.
35. Built Environment
Definition: Refers to the human-designed surroundings essential for daily life.
Includes Elements:
Infrastructure such as sidewalks, parks, transport networks, grocery access, housing designs, and traffic layouts.
Relevance of Built Environment
Disparities in communities include:
Uneven resource distribution leading to poorer outcomes in health due to increased pollution, inadequate facilities, and limited access to healthy lifestyle choices.
36. UNAIDS 90-90-90 and 95-95-95 Targets
Overview: A set of ambitious goals to end the AIDS epidemic by 2030. Highlight notable benchmarks relating to therapy success rates, diagnoses, and viral suppression.
Targets Defined
A high percentage of individuals living with HIV should be aware of their HIV status.
A substantial proportion of diagnosed individuals should be on sustained antiretroviral therapy.
A notable percentage of those treated should achieve viral suppression.
Interpretation of AIMS
Focus on minimizing both HIV-related illnesses and transmission by improving access to testing, treatments, and public health strategies.
37. Health Literacy Concepts
Definition: The capacity to obtain, comprehend, and effectively utilize health information.
Foundational Importance: Recognized by Healthy People 2030 as vital for enhancing community health efforts.
Reasons Health Literacy Matters
Low health literacy correlates with:
Reduced understanding of medical instructions.
Decreased participation in screening programs.
Poor medication adherence.
Limited engagement with preventive healthcare.
Public Health Nursing Context
Integrates principles of health literacy within communication strategies, education, prevention services, and health equity efforts.