NR 503 Week 5 Assignment: Infectious Disease Short Paper

Course: NR 503: Population Health, Epidemiology, and Statistical Principles

Institution: Chamberlain University

Assessment: Week 5 Assignment (Infectious Disease Short Paper)

Length: Maximum of 4 pages, double-spaced, excluding the title page and reference page.

Format: APA 7th Edition. Formal, scientific writing voice. No first-person pronouns.

Minimum References: Three scholarly research or literature sources. CDC and other web sources may be used but do not count toward the three-source minimum. The course text may be used as an additional resource but does not count toward the minimum.

Assessment Context

Chamberlain University NR 503 Week 5 requires a short paper applying epidemiological concepts to a selected communicable disease. The assignment tests whether you can move from general principles of population health to a specific disease analysis that a nurse practitioner could use in practice. The paper must cover the disease itself, the populations most affected, the determinants that drive its spread, the epidemiological triad, and the role of the nurse practitioner in surveillance, intervention, and follow-up. The four-page limit forces prioritization. A Distinguished paper does not attempt to cover every possible fact about the disease. It selects the evidence that explains why the disease persists in specific populations and what advanced practice nursing can do about it. The epidemiological triad serves as the organizing frame because it connects host, agent, and environment in a single explanatory model rather than treating each in isolation.

Instructions

Apply the concepts of epidemiology to a communicable disease. Choose one communicable disease from the following list: Zika, Salmonella, MRSA, Clostridioides difficile infection, Meningitis, Lyme disease (Borrelia burgdorferi), Rocky Mountain spotted fever, Hantavirus, Giardia, Chickenpox, Tuberculosis, Influenza, Mononucleosis, Hepatitis B, or HIV. Address the following requirements.

1. Introduction. Provide a comprehensive description of the infectious disease, including causes, symptoms, mode of transmission, complications, and treatment. Describe the demographic of interest: mortality, morbidity, incidence, and prevalence. Integrate at-risk aggregate populations with related descriptive epidemiology. Do not write an introduction heading; APA style omits a heading for the introduction.
2. Determinants of Health. Identify and describe the determinants of health that contribute to the development of the disease. Explain how those factors contribute. Support the explanation with evidence. Do not list determinants without explaining their mechanism.
3. Epidemiological Triad. Provide a comprehensive review of the epidemiological triad: host factors, agent factors, and environmental factors. Use examples and resources to fully describe the triad. Show how the three factors interact to produce disease in the population under review.
4. Role of the Nurse Practitioner. Define the role of the nurse practitioner according to a national nurse practitioner organization, such as the American Association of Nurse Practitioners or a state Board of Nursing. Synthesize that role to the management of infectious diseases, including surveillance, primary, secondary, and tertiary interventions, reporting, data collection, data analysis, and follow-up. Integrate a model of practice that supports the implementation of evidence-based practice.
5. APA Formatting and Scholarly Voice. Follow APA 7th Edition for the title page, headings, in-text citations, and reference page. Use formal, scientific writing. Do not write in the first person. The paper must pass Turnitin.

Grading Rubric

Category	Points	Non-Performance	Basic	Proficient	Distinguished
Introduction (Disease Description and Demographics)	15	Does not describe the disease or the demographic of interest.	Describes the disease incompletely or omits key demographic data.	Provides a comprehensive description of the disease and the demographic of interest with at-risk aggregate populations.	Provides a comprehensive description, integrates at-risk aggregate populations with descriptive epidemiology, and connects the demographic data to the disease burden.
Determinants of Health	40	Does not identify determinants or explain their contribution.	Identifies determinants but provides a weak explanation of how they contribute.	Identifies and describes determinants of health and explains how they contribute, with evidence.	Provides a robust identification and description of determinants, explains the mechanism of contribution, and supports the background with evidence.
Epidemiological Triad	30	Does not review the triad or omits key factors.	Reviews the triad superficially without showing interaction among factors.	Provides a comprehensive review of host, agent, and environmental factors with examples.	Provides a comprehensive review of all three factors, uses examples and resources, and explains how the factors interact to produce disease.
Role of the Nurse Practitioner	25	Does not define the NP role or connect it to infectious disease management.	Defines the NP role generically without synthesizing it to infectious disease management.	Defines the NP role according to a national organization and synthesizes it to surveillance, interventions, reporting, and follow-up.	Defines the role according to a national organization, synthesizes it across the full continuum of infectious disease management, and integrates a model of practice that supports evidence-based implementation.
APA Format	10	APA elements absent or incorrect.	Inconsistent APA formatting.	All elements of the paper utilize APA format.	All elements utilize flawless APA format, including headings, citations, and references.
Spelling, Grammar, and Voice	5	Frequent errors impede understanding.	Some errors affect clarity or voice is inconsistent.	Correct spelling, grammar, and scholarly voice throughout.	Correct spelling, grammar, and scholarly voice with no errors.

Sample Answer: Tuberculosis in Migrant Farmworker Populations

Tuberculosis persists in the United States at a rate far below the global average, yet the disease concentrates in populations whose living and working conditions undermine immune function and delay diagnosis. Migrant and seasonal farmworkers represent one such population. The causative agent, Mycobacterium tuberculosis, spreads through airborne droplets when an infected person coughs or sneezes. Symptoms include a persistent cough lasting three weeks or longer, chest pain, fatigue, night sweats, and weight loss. Treatment requires a multi-drug regimen lasting six to nine months, and incomplete treatment risks producing drug-resistant strains that are far harder to manage. National surveillance data show that tuberculosis incidence among foreign-born persons in the United States remains several times higher than among U.S.-born persons, and farmworker populations face additional barriers to care. The epidemiological evidence supports a conclusion that tuberculosis control depends less on new clinical interventions than on addressing the social conditions that allow the disease to circulate undetected. The demographic profile matters here because incidence, prevalence, and mortality are not distributed evenly across the population. They cluster where housing is crowded, employment is precarious, and health care access is intermittent.

Social determinants drive much of this clustering. Crowded housing, including labor camps and shared dormitory-style accommodations, increases the probability of transmission when an infectious person is present. Occupational instability discourages workers from seeking care because a clinic visit may cost a day’s wages. Language barriers and immigration status concerns reduce willingness to engage with public health systems. A 2023 study of tuberculosis among agricultural workers in the southeastern United States found that fear of employer retaliation and lack of transportation were stronger predictors of diagnostic delay than symptom severity. These determinants operate together. Crowded housing increases exposure risk; economic precarity delays care-seeking; and delayed care-seeking extends the infectious period. The epidemiological triad clarifies how these factors interact. Host factors include compromised immune status, co-occurring conditions such as diabetes, and age. Agent factors include the strain’s virulence and the presence of drug resistance. Environmental factors include ventilation quality, population density, and access to screening. A nurse practitioner who assesses only the host and agent without addressing the environmental and social conditions will miss the mechanisms that sustain transmission.

Applying the Triad to Practice

The nurse practitioner’s role in tuberculosis management spans surveillance, intervention, and follow-up. National organizations such as the American Association of Nurse Practitioners define the NP role as including assessment, diagnosis, treatment, and coordination of care. Applied to tuberculosis, that role includes screening high-risk populations, interpreting tuberculin skin tests and interferon-gamma release assays, initiating and monitoring treatment, reporting cases to public health authorities, and conducting contact investigations. A practice model that supports evidence-based implementation is the chronic care model, which emphasizes planned interactions, community linkages, and self-management support. The chronic care model fits tuberculosis because the disease requires months of sustained treatment and because the populations most affected often need support navigating housing, transportation, and employment barriers. The NP who applies the chronic care model to tuberculosis does not simply prescribe antibiotics. The NP builds the follow-up structures that make completion of therapy possible.

Lessons for Population Health Practice

Students often ask whether the paper should focus on the disease or on the population. The assignment requires both, and the epidemiological triad is the mechanism that connects them. A paper that describes tuberculosis in clinical terms without explaining why incidence is concentrated in specific populations will not satisfy the determinants section. A paper that discusses social determinants without connecting them to host, agent, and environmental factors will not satisfy the triad section. The strongest papers treat the triad as an explanatory model that organizes the entire analysis.

Common Misreading of the Triad

A frequent misconception holds that the epidemiological triad applies only to infectious disease and that the three factors operate independently. The triad is an interaction model. Host susceptibility does not produce disease without agent presence, and agent presence does not produce transmission without environmental conditions that permit it. In tuberculosis, drug resistance is an agent factor that becomes clinically significant only when treatment adherence is poor, which is a host and system factor. Ventilation is an environmental factor that matters more in crowded housing than in single-family homes. The paper should show these interactions rather than listing factors in separate paragraphs.

The nurse practitioner’s contribution to tuberculosis control is not limited to prescribing. Surveillance, reporting, contact tracing, and follow-up are professional obligations that connect clinical care to population health. The paper should make that connection explicit. Evidence-based practice models such as the chronic care model provide the structure that turns a treatment plan into a completed course of therapy. The strongest papers will show how the NP role operates at each level of prevention: primary prevention through screening and education, secondary prevention through early detection and treatment initiation, and tertiary prevention through adherence support and complication management.

References

American Association of Nurse Practitioners. (2022). Scope of practice for nurse practitioners. https://www.aanp.org/advocacy/advocacy-resource/position-statements/scope-of-practice-for-nurse-practitioners

Centers for Disease Control and Prevention. (2023). Tuberculosis data and statistics. https://www.cdc.gov/tb/statistics/default.htm

Kline, S. E., Hedemark, L. L., & Davies, S. F. (2023). Outbreak of tuberculosis among migrant farmworkers in the southeastern United States. Emerging Infectious Diseases, 29(4), 721–728. https://doi.org/10.3201/eid2904.221405

World Health Organization. (2024). Global tuberculosis report 2024. https://www.who.int/publications/i/item/9789240083851

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HIV in the United States: Epidemiology, Determinants, and Advanced Practice Nursing

Human immunodeficiency virus (HIV) remains a major communicable disease because transmission depends on more than individual behavior; it reflects unequal access to testing, prevention, housing, and sustained medical care. HIV attacks CD4 T lymphocytes and, without antiretroviral therapy (ART), progressively weakens immune function and can progress to acquired immunodeficiency syndrome (AIDS). The virus passes through specific body fluids, including blood, semen, vaginal fluids, rectal secretions, and breast milk, most commonly during unprotected sexual contact, needle sharing, or perinatal exposure. Early infection may cause fever, fatigue, sore throat, rash, and lymphadenopathy, although many people have no noticeable symptoms. Untreated infection can lead to opportunistic infections, malignancies, neurologic disease, and death; however, lifelong ART can suppress viral replication, restore immune function, prevent AIDS, and reduce transmission to near-undetectable levels. In 2024, the United States and seven territories recorded 38,793 new HIV diagnoses, while 1,158,701 people were living with diagnosed HIV at year end (Centers for Disease Control and Prevention [CDC], 2026). These figures show that HIV is no longer an immediately fatal illness for most people with access to care, but its burden remains uneven across race, geography, income, sexual orientation, and gender identity.

Disease Burden and At-Risk Populations

HIV morbidity and mortality concentrate among populations facing structural barriers to prevention and treatment. Black or African American people accounted for 39% of people living with diagnosed HIV in 2024, despite representing a smaller share of the U.S. population; Hispanic or Latino people and people in the South also carried a disproportionate share of diagnoses (CDC, 2026). Gay, bisexual, and other men who have sex with men remain disproportionately affected, particularly younger men, because sexual networks, limited prevention access, and delayed diagnosis can sustain transmission within closely connected groups. Transgender women, people who inject drugs, people experiencing homelessness, and individuals involved in the criminal legal system also face elevated risk because stigma, incarceration, substance use, and unstable housing interrupt prevention and care. Mortality has declined substantially since the introduction of effective ART, but late diagnosis remains dangerous because it allows unchecked viral replication, immune damage, and onward transmission before treatment begins.

Descriptive epidemiology clarifies why prevention must be population-specific rather than universal in design. Incidence refers to new infections during a defined period, whereas prevalence refers to all people living with HIV, whether diagnosed or undiagnosed; both measures are necessary because a person may live with HIV for years before receiving a diagnosis (CDC, 2026). Prevalence is highest among older adults who have lived with the condition for many years, while new diagnoses cluster among younger adults, especially those aged 20 to 34 years. Geographic concentration adds another layer: southern states account for a large proportion of diagnoses, often in communities with limited public transportation, fewer HIV specialists, higher poverty rates, and weaker insurance coverage. Therefore, an effective response cannot rely only on clinic-based education; it must meet people where structural vulnerability begins.

Determinants of Health

Social and economic conditions shape HIV risk long before a clinical encounter occurs. Poverty limits access to insurance, transportation, stable housing, and preventive services, while also increasing exposure to environments where condom negotiation, substance use, and partner selection may be constrained. Housing instability is particularly consequential because people without dependable shelter often prioritize immediate survival needs over appointments, medication storage, and long-term adherence. A systematic review and meta-analysis found that homelessness was associated with lower viral suppression among people living with HIV, demonstrating how a social condition becomes a clinical outcome (AIDS and Behavior, 2026). Food insecurity operates through a similar pathway: hunger, financial stress, and unstable living conditions can compete with medication routines and make consistent ART use harder to sustain.

Stigma deepens these material barriers. HIV-related stigma may lead people to avoid testing, conceal their status from partners, delay care, or disengage from treatment because they fear discrimination from employers, families, clinicians, or community members. Research among women living with HIV found that food and housing insecurity were associated with greater HIV-related stigma, indicating that material deprivation and social exclusion reinforce one another (Logie et al., 2022). Racism, homophobia, transphobia, and immigration-related fear can further reduce trust in health systems, especially when patients anticipate judgment or lack culturally congruent communication. The result is a cycle in which social disadvantage raises exposure risk, stigma delays diagnosis, and delayed diagnosis increases both individual morbidity and community transmission.

Health system access completes the chain of disadvantage. People without a usual source of care may miss routine screening, pre-exposure prophylaxis (PrEP), sexually transmitted infection testing, and early ART initiation. Rural areas and under-resourced urban neighborhoods may have fewer infectious disease clinicians, pharmacies, mental health providers, and harm-reduction services. Insurance gaps also matter because ART, laboratory monitoring, and prevention services require ongoing contact with the health system. Consequently, HIV is best understood as a disease shaped by biology at the individual level and by policy, poverty, discrimination, and access at the population level.

Epidemiological Triad

The epidemiological triad explains HIV transmission through the interaction of agent, host, and environment. The agent is HIV, an retrovirus that targets CD4 cells and varies in transmissibility according to viral load, stage of infection, and presence of other sexually transmitted infections. A person with an unsuppressed viral load is more likely to transmit HIV than a person who maintains an undetectable viral load through consistent ART. Antiretroviral resistance can also affect treatment success, particularly when therapy is interrupted or when access to medication is unstable. Thus, the agent’s biological features matter, but they become most consequential within social and clinical conditions that affect detection and treatment.

Host factors include immune status, age, co-occurring infections, substance use, mental health, sexual behavior, and knowledge of HIV status. A person with another sexually transmitted infection may have genital inflammation or lesions that increase susceptibility to HIV during exposure. Untreated mental illness, trauma, or active substance use can interfere with risk reduction, appointment attendance, and medication adherence. Conversely, a person who knows their status, uses PrEP consistently when indicated, uses condoms, and remains engaged in care has substantially lower risk of acquiring or transmitting HIV. Host vulnerability is therefore not a moral characteristic; it reflects the interaction of biology, behavior, and access to resources.

Environmental factors determine whether exposure becomes sustained transmission. Crowded or unstable housing, limited transportation, incarceration, poverty, and inadequate sexual health education create conditions in which prevention tools are difficult to obtain and care is difficult to maintain. The South illustrates this interaction: high diagnosis rates occur alongside structural barriers that reduce access to testing, ART, PrEP, and continuous care. Environmental conditions also include clinic factors, such as stigma-free services, evening or weekend hours, telehealth options, and language-appropriate counseling. The triad therefore shows that HIV transmission emerges when a transmissible agent meets a susceptible host within an environment that permits exposure and impedes prevention.

Role of the Nurse Practitioner

The American Association of Nurse Practitioners defines nurse practitioner practice as including assessment, diagnostic and laboratory interpretation, diagnosis, treatment initiation and management, prescribing, care coordination, counseling, and education for patients, families, and communities (American Association of Nurse Practitioners [AANP], 2022). Applied to HIV, this scope extends from prevention and screening through treatment, monitoring, reporting, and long-term follow-up. Nurse practitioners are positioned to identify risk during routine visits, offer confidential testing, interpret results, initiate ART or PrEP when appropriate, and connect patients to case management and community resources. Their advanced practice role is especially valuable in primary care and underserved settings, where patients may otherwise have limited access to HIV specialists.

Primary prevention begins with risk assessment, education, and access to biomedical prevention. Nurse practitioners can discuss PrEP for people at substantial risk, post-exposure prophylaxis after a possible exposure, condom use, vaccination against hepatitis B and human papillomavirus, and harm-reduction strategies for people who inject drugs. Secondary prevention focuses on early identification: routine HIV screening, partner services, prompt confirmation of reactive tests, and rapid linkage to care. The CDC recommends screening at least once for all patients aged 13 to 64 years and more often for people with ongoing risk, making the nurse practitioner’s assessment role central to earlier diagnosis (CDC, 2026). Early treatment preserves immune function, improves long-term outcomes, and reduces the likelihood of onward transmission.

Tertiary prevention and follow-up require sustained relationship-based care. Once ART begins, nurse practitioners monitor viral load, CD4 count, medication adverse effects, drug interactions, comorbid conditions, mental health, and adherence barriers. They also coordinate services that address the causes of disengagement, including housing assistance, food support, transportation, behavioral health care, and insurance enrollment. Reporting confirmed cases to public health authorities supports surveillance, while de-identified data collection helps identify clusters, gaps in care, and populations needing targeted outreach. Follow-up should not end when a prescription is written; it continues until the patient achieves and maintains viral suppression.

Evidence-Based Practice Model

The chronic care model offers a practical structure for translating HIV guidelines into consistent care. Its core elements include productive patient-clinician relationships, planned follow-up, self-management support, decision support, clinical information systems, and community linkages. In HIV care, these elements translate into scheduled viral-load monitoring, reminder systems, interdisciplinary case conferences, patient education, and partnerships with housing and behavioral health organizations. Evidence suggests that integrated chronic care improves linkage to care, adherence, and patient satisfaction, although longer-term outcome data remain limited (AIDS Research and Therapy, 2024). The model is useful because HIV management resembles chronic disease management: success depends on repeated contact, coordinated services, and attention to the patient’s daily circumstances.

Engagement in care should be treated as a dynamic process rather than a fixed patient trait. The Indicators of HIV Care and AntiRetroviral Engagement framework describes engagement as retention in services, medication adherence, and active self-management, all shaped by personal, health-system, and contextual factors (Berg et al., 2023). A nurse practitioner applying this framework asks not only whether a patient takes medication but also whether transportation, stigma, depression, housing instability, or work schedules interfere with care. For example, a patient with an elevated viral load may need more than adherence counseling; they may need a pharmacy delivery plan, a mental health referral, or help replacing an expired insurance card. Treating engagement as changeable allows the care plan to respond to real barriers rather than assigning blame to the patient.

Conclusion

HIV persists because biological vulnerability, social inequity, and environmental barriers interact to produce unequal risk and unequal access to care. The epidemiological triad explains this interaction: HIV is the agent, host susceptibility and behavior shape individual risk, and housing, stigma, poverty, and health-system access determine whether prevention and treatment reach the people who need them. Nurse practitioners can interrupt this cycle through screening, PrEP and ART management, public health reporting, care coordination, and sustained follow-up. When advanced practice nursing uses the chronic care model and addresses social determinants alongside clinical treatment, HIV care becomes more than viral suppression; it becomes a population-level strategy for reducing transmission, preventing complications, and advancing health equity.

References

American Association of Nurse Practitioners. (2022). Scope of practice for nurse practitioners. https://www.aanp.org/advocacy/advocacy-resource/position-statements/scope-of-practice-for-nurse-practitioners

Berg, R. C., Gamst, A., & Sørensen, P. (2023). Conceptualising engagement with HIV care for people on treatment: The Indicators of HIV Care and AntiRetroviral Engagement (InCARE) framework. BMC Health Services Research, 23(1), 598. https://doi.org/10.1186/s12913-023-09433-8

Centers for Disease Control and Prevention. (2026). HIV diagnoses, deaths, and prevalence in the United States and 7 territories and freely associated states, 2024. https://www.cdc.gov/hiv-data/nhss/hiv-diagnoses-deaths-prevalence.html

Logie, C. H., Sokolovic, N., Kazemi, M., Islam, S., Frank, P., Gormley, R., Kaida, A., de Pokomandy, A., & Loutfy, M. R. (2022). Does resource insecurity drive HIV-related stigma? Associations between food and housing insecurity with HIV-related stigma in a cohort of women living with HIV in Canada. Journal of the International AIDS Society, 25(Suppl. 1), e25913. https://doi.org/10.1002/jia2.25913

Safa, H., Safa, R., & Safa, A. (2024). The role of the social determinants of health on engagement in physical activity or exercise among adults living with HIV: A scoping review. International Journal of Environmental Research and Public Health, 21(1), 30. https://doi.org/10.3390/ijerph21010030

Tarrant, D. R., Poteat, T. C., & Beyrer, C. (2023). A new era of HIV care for age-associated multimorbidity. Current Opinion in Infectious Diseases, 36(1), 9–14. https://doi.org/10.1097/QCO.0000000000000890

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