| Course | PHLT 8522 Epidemiological Investigations |
|---|---|
| Week | Week 3 |
| Paper type | Case finding plan |
| Length | About 1,020 words, 6 pages |
| Format | APA 7 student paper |
| School | Walden University |
| Program | PhD in Public Health |
| Updated | October 2026 |
Free sample paper for PHLT 8522 Week 3
Where Would a Missed Case Be? A Case Finding Plan Searching Four Hiding Places for Composite Histoplasmosis Cases After a Riverfront Demolition, With an Estimate of What Stays Unseen
Student Name
Walden University
PHLT 8522: Epidemiological Investigations
Instructor Name
Month Day, Year
Where Would a Missed Case Be? A Case Finding Plan Searching Four Hiding Places for Composite Histoplasmosis Cases After a Riverfront Demolition, With an Estimate of What Stays Unseen
Starting Point
Seven people now meet the outbreak case definition: the three original reports and four more found in the first week, all probable on antigen testing, with convalescent serology pending. Passive reporting found them because a clinician thought to order a fungal test. Every case the investigation has not yet found is a person for whom something in that chain did not happen. This plan identifies four places such cases could be, names the record that reaches each, assigns the work and estimates how many cases will remain unseen when the searches end. Reingold (1998) observes that early counts in an outbreak usually reflect who was tested, not who was ill, and the plan treats the current seven as a floor.
Hiding Place One: Pneumonia Never Tested for Fungi
Why Cases Hide Here
Most adults with community-acquired pneumonia are treated empirically for bacterial infection. Fungal testing is ordered when pneumonia fails to improve, when the patient mentions an exposure, or when a clinician recalls an alert. A healthy adult with mild outbreak-related pneumonia may recover on antibiotics and never be tested.
How to Reach Them
The three hospitals and two urgent-care groups will query their records for visits with a pneumonia diagnosis or abnormal chest imaging between September 4 and the present, among patients with an address or employer address in the district or within one kilometer of it. A visit whose patient shares a home or a workplace with someone already counted moves straight into the suspect tier; every other visit is still a candidate for outreach. Outreach offers testing: urine antigen now and serology at the visit, with a second serum sample two to three weeks later. Patients who recovered weeks ago may decline, so the outreach script explains that a result helps the department protect neighbors and coworkers, not only the patient.
Expected Yield
The composite query returned 61 pneumonia visits among people with district addresses since September 4, against about 35 in the same weeks of the prior year. If the excess of 26 visits reflects the outbreak, this hiding place could hold most of the missed cases.
Hiding Place Two: A Test That Could Not See It
Why Cases Hide Here
A negative test does not always mean no infection. Antigen detection is less sensitive in milder and subacute illness; in one multicenter evaluation, antigen was found in urine of 83.3% of patients with acute histoplasmosis but only 30.4% of those with subacute illness (Hage et al., 2011). Antibodies take weeks to appear, so serum drawn in the first days of illness can be negative.
How to Reach Them
Laboratories will list every Histoplasma antigen or antibody test ordered since September 4 for patients from the district, including negatives. Patients with a negative early test and compatible illness will be offered convalescent serology. Azar and Hage (2017) review how antigen and antibody tests perform differently by clinical form and timing, which supports retesting with a second method rather than accepting one negative result.
Hiding Place Three: A Diagnosis in Another Jurisdiction
Why Cases Hide Here
The district sits on the river, and many who work there live in the neighboring county or across the state line. A case diagnosed by a clinician in another jurisdiction is reported, if at all, to that jurisdiction's health department, and the person's exposure in this city may never be recorded.
How to Reach Them
The department will send a notice through the state's epidemic information exchange and call the epidemiologists in the two neighboring counties and across the river, sharing the case definition and asking for any histoplasmosis report since September 4, with work or travel history. Employers in the district will be asked to share the notice with staff, so that workers who were tested elsewhere can contact the department directly.
Hiding Place Four: A Death Recorded as Pneumonia
Why Cases Hide Here
Severe histoplasmosis can be fatal, particularly in people with weakened immune systems, and a death certificate may list pneumonia without a cause. Outbreak-related deaths are uncommon; Benedict and Mody (2016) found that about 1% of patients in outbreaks with death data died. But a missed death would matter both for the count and for the department's account of severity.
How to Reach Them
Vital records will provide death certificates since September 4 that list pneumonia, respiratory failure or sepsis among people with district addresses. For any match, the department will review hospital records for fungal testing or pathology, and where an autopsy was performed, the medical examiner will be asked whether tissue was examined for fungal organisms. Deaths among people who only worked in the district will be harder to find, since certificates record residence; the employer notices in hiding place three ask colleagues to report any death of a coworker with a respiratory illness.
Assignments and Timing
Table 1
Case Finding Searches, Owners and Deadlines (Composite)
| Search | Records | Owner | Due | |
|---|---|---|---|
| Untested pneumonia | Hospital and urgent-care visit queries | Surveillance epidemiologist | Five working days | |
| Negative or early tests | Laboratory order lists | Communicable disease nurse | Five working days | |
| Other jurisdictions | Epidemic information exchange and calls | Epidemiology fellow | Three working days | |
| Deaths | Vital records extract | Vital records analyst | Seven working days | |
Note. Deadlines are illustrative.
What Will Stay Unseen
Even with all four searches, some cases will not be found: people with mild illness who never sought care, people who sought care but decline testing, and people whose antibodies never rise enough to meet the definition. Outbreak investigations often find that many infections are asymptomatic or mild (Benedict & Mody, 2016). If the excess pneumonia visits in hiding place one yield cases at the rate seen among the first seven outreach contacts, about half, the investigation might find 12 to 15 more people with clinical illness. The plan will report its final count as a minimum, with the number of untested excess visits stated beside it, so readers can see the size of the gap.
References
Azar, M. M., & Hage, C. A. (2017). Laboratory diagnostics for histoplasmosis. Journal of Clinical Microbiology, 55(6), 1612-1620. https://doi.org/10.1128/JCM.02430-16
Benedict, K., & Mody, R. K. (2016). Epidemiology of histoplasmosis outbreaks, United States, 1938-2013. Emerging Infectious Diseases, 22(3), 370-378. https://doi.org/10.3201/eid2203.151117
Hage, C. A., Ribes, J. A., Wengenack, N. L., Baddour, L. M., Assi, M., McKinsey, D. S., Hammoud, K., Alapat, D., Babady, N. E., Parker, M., Fuller, D., Noor, A., Davis, T. E., Rodgers, M., Connolly, P. A., El Haddad, B., & Wheat, L. J. (2011). A multicenter evaluation of tests for diagnosis of histoplasmosis. Clinical Infectious Diseases, 53(5), 448-454. https://doi.org/10.1093/cid/cir435
Reingold, A. L. (1998). Outbreak investigations: A perspective. Emerging Infectious Diseases, 4(1), 21-27. https://doi.org/10.3201/eid0401.980104
What the PHLT 8522 Week 3 instructions ask for
Case finding weeks ask students to plan how an investigation will find cases that passive reporting missed. Prompts usually mention record reviews, laboratory queries, clinician outreach, alerts to neighboring jurisdictions and vital records. Instructors want each search tied to a specific reason cases might be missed and a specific data source that would reveal them. Assigning owners and deadlines is often expected, since a plan without them rarely happens. Students may be asked to estimate how many cases remain undetected and how the final count will be reported. Most plans run a few pages and include a table of searches. Citations should cover the laboratory tests involved and the epidemiology of the condition, including how often infection is mild or silent.
How the PHLT 8522 Week 3 example is put together
An opening section treats the current count as a floor and cites a perspective on early outbreak counts. Four sections follow, one per hiding place, each split into why cases hide there, how to reach them and, for the first, the expected yield from an excess of pneumonia visits. The second section uses multicenter data on antigen sensitivity in acute and subacute disease. The third describes notices to neighboring jurisdictions and employers. The fourth uses vital records and a published death rate in outbreaks. Table 1 assigns each search an owner and a deadline. A final section estimates the unseen remainder and commits to reporting the count as a minimum beside the number of untested excess visits.
Reading the PHLT 8522 Week 3 rubric
Planning papers are graded on coverage, specificity and realism. The sample covers four distinct mechanisms by which cases escape notice, each matched to a record that can reveal them, which earns the coverage block. Specificity credit comes from naming queries, codes, time windows and outreach steps rather than general intentions. Realism credit comes from owners, deadlines and an expected yield grounded in the excess visit count. Using test performance data to justify retesting earns evidence credit. The estimate of unseen cases, with a commitment to report the count as a minimum, shows judgment about what the plan cannot achieve. Clear tables and correct sources secure the remaining marks. Plans that say only "contact hospitals" tend to score low on specificity.
PHLT 8522 Week 3 help: mistakes that cost marks
Plans lose marks when they list agencies to call without saying what to ask for. For each search, state why a case might be missed there and which record would show it. Specify the query: diagnoses, dates, addresses. Explain how people found by a search become cases, for example by offering testing. Use test performance data to decide when a negative result should be repeated. Assign an owner and a deadline to every search. Estimate how many cases you still expect to miss and say how you will report the final count. Remember jurisdictions next door. We can draft a first case finding plan around your own scenario for free.
Get a PHLT 8522 Week 3 example written to your instructions
Tell the desk which case definition your section adopted and which reporting sources the scenario describes; the Week 3 prompt and rubric complete the request. The plan identifies where missed cases would hide, gives each search an owner and a date, and estimates what the search could still miss. First plan free; allow 24-48 hours.
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PHLT 8522 Week 3 questions, answered
Where can I find a free PHLT 8522 Week 3 sample paper?
The Week 3 case finding plan appears above in full, searching four places missed histoplasmosis cases could be, with an assignments table and real references.
What is active case finding in an outbreak?
It means searching records, laboratories, clinicians and other sources for cases that were not reported, instead of waiting for reports to arrive.
Why might a histoplasmosis case be missed?
Many patients with pneumonia are never tested for fungi, early antibody tests can be negative, antigen tests are less sensitive in milder illness and some patients are diagnosed in other jurisdictions.
Should a negative antigen test rule out histoplasmosis?
Not in an outbreak setting. Antigen sensitivity was 30.4% in subacute illness in one multicenter study, so a compatible patient with a negative test should be offered convalescent serology.
How should the final case count be reported?
As a minimum, with the number of untested people who might have been cases stated beside it, which shows readers how large the gap might be.