DHA 731 Week 7 Analysis of an Emerging Epidemic Example

Before It Reaches the Clinic: Preparing a Rural Health System in North Carolina's Farm Country for H5N1 Avian Influenza

[Student Name]

University of Phoenix

DHA/731: Population Health and Epidemiology

Week 7 Assignment

[Instructor Name]

[Date]

The health network, local farms and plants, workforce counts, plans and exercises are composites written for a model paper; research findings come from the sources cited, and the epidemic's status is described as of the studies cited.

The state agriculture department's alert arrived on a Monday: highly pathogenic avian influenza had been detected in a commercial poultry flock two counties away. The region's four rural counties include poultry farms and a processing plant employing about 2,400 workers, many of them immigrants who speak Spanish or Haitian Creole and have limited access to health care. By Wednesday the vice president wanted a written threat assessment and a draft response. This paper presents that analysis.

The Agent

H5N1 is an influenza A virus that has circulated among wild birds and poultry for decades, causing severe outbreaks in flocks. Human infections worldwide have been rare but sometimes severe, usually after close contact with infected birds. The concern for public health is that the virus could acquire the ability to spread efficiently between people. Influenza viruses change constantly, and each human infection gives the virus another chance to adapt, which is why detecting and treating cases among exposed workers matters beyond the individual patient.

A New Host: Dairy Cattle

In 2024, the virus appeared in a new host. Garg and colleagues reported that highly pathogenic avian influenza A(H5N1) viruses were detected in US dairy cattle beginning in March 2024, spreading among herds in several states, and that two human cases were identified among dairy workers; CDC assessed the risk to the general public as low while calling for monitoring and protection of exposed workers (Garg et al., 2024).

The First Human Case Linked to Cattle

The first case showed the typical pattern. Uyeki and colleagues described a Texas dairy farm worker who developed conjunctivitis after exposure to cattle, tested positive for H5N1, was treated with an antiviral and recovered; household contacts did not become ill, and the virus carried a genetic change associated with adaptation to mammals (Uyeki et al., 2024).

Infections That Go Unrecognized

Detected cases may understate infections. Mellis and colleagues surveyed 115 dairy workers in Michigan and Colorado in the summer of 2024 and found serologic evidence of recent H5 infection in eight, or 7%, all of whom had milked cows or cleaned milking parlors, and four of whom recalled being ill around the time cows were sick (Mellis et al., 2024). Some workers were infected without anyone, including themselves, knowing it.

Separating Facts From Uncertainty

Known facts: human infections have followed close contact with infected animals, most have been mild and sustained spread between people has not been documented in the studies reviewed. Uncertainties: how many infections go undetected, whether the virus will adapt further and how poultry workers' risk compares with dairy workers'.

The Region's Exposed Populations

Locally, the most exposed are poultry farm workers, catchers and haulers, processing plant workers who handle birds early in processing and workers involved in culling infected flocks. Many are immigrants with limited English, uncertain immigration status, no paid sick leave and fear of losing wages if they report illness. Some live in shared housing near the plant and ride to work together, conditions that would matter if person-to-person spread ever developed.

Lessons From the Pandemic

The region has been here before. During the COVID-19 pandemic, meat and poultry processing plants across the country, including in North Carolina, became sites of large outbreaks, because workers stood close together on production lines, shared transportation and housing and often could not afford to stay home when sick. Local clinicians remember that outreach through churches, community groups and trusted bilingual staff reached plant workers when official notices did not. Those lessons shape this plan.

Barriers to Detection

These barriers matter for detection. A worker with red, irritated eyes may not seek care, may not mention bird exposure and may not be tested. The same factors that hid infections among dairy workers could hide them among poultry workers.

Risk Assessment

For the general public in the region, current evidence supports a low risk. For exposed workers, risk is higher and uncertain. For the health system, the main risks are missed cases that could give the virus opportunities to adapt, exposure of staff and, in an unlikely but serious scenario, human-to-human spread requiring surge capacity.

Action One: Surveillance With Public Health

The hospitals will work with county health departments to flag patients with conjunctivitis or influenza-like illness who report animal exposure, test them using public health laboratory channels and report promptly.

Action Two: Worker Outreach

Community health workers who speak Spanish and Haitian Creole will visit farms and the plant with employers' cooperation, explaining symptoms, where to get free testing and that care does not depend on immigration status.

Action Three: Protection and Treatment

The region will help supply eye protection, respirators and gloves for high-exposure tasks and ensure clinics have antivirals for treatment and for exposed contacts, as public health guidance recommends.

Action Four: Seasonal Influenza Vaccination

Offering seasonal flu vaccine to exposed workers reduces the chance that a person is infected with both seasonal and avian viruses at once, a situation that could allow the viruses to exchange genes.

Action Five: Protecting Hospital Staff

Emergency and clinic staff who evaluate a patient with possible H5N1 need respirators, eye protection and isolation rooms. The hospitals will post screening questions about animal exposure at registration, in several languages, so that suspected cases are masked and placed in a separate room before evaluation.

Action Six: Working With Employers

The processing plant and larger farms have an interest in keeping workers healthy and operations running. The region will ask employers to allow paid time for testing, to encourage workers to report symptoms without penalty and to share information about flock detections quickly. Employer cooperation will decide whether outreach reaches workers on the line.

Action Seven: Surge Planning

The hospitals will review respiratory surge plans, isolation capacity and supplies developed during the pandemic and hold a tabletop exercise simulating a cluster of cases among plant workers.

Costs

The plan's first-year cost is modest, about $140,000 for community health worker time, translation, protective equipment and the exercise, much of it eligible for public health preparedness funding. The cost of a missed cluster, in illness, lost trust and emergency response, would be far higher.

Triggers

Preparedness will shift to response if a human case occurs in the region, if cases appear without animal exposure or if federal assessments of public risk change. The population health team will review federal and state reports weekly and update the board monthly, noting the date of each assessment, since the situation can change faster than plans are revised.

Conclusion

H5N1 has moved from birds to dairy cattle and to a small number of workers, mostly with mild illness, and serologic evidence shows some infections go unrecognized. Risk to the public remains low, but exposed poultry and plant workers face real and uncertain risk. Surveillance, outreach in workers' languages, protection, treatment and surge planning give the region a proportionate response.

References

Garg, S., Reed, C., Davis, C. T., Uyeki, T. M., Behravesh, C. B., Kniss, K., Budd, A., Biggerstaff, M., Adjemian, J., Barnes, J. R., Kirby, M. K., Basler, C., Szablewski, C. M., Richmond-Crum, M., Burns, E., Limbago, B., Daskalakis, D. C., Armstrong, K., Boucher, D., ... Dugan, V. (2024). Outbreak of highly pathogenic avian influenza A(H5N1) viruses in U.S. dairy cattle and detection of two human cases, United States, 2024. MMWR. Morbidity and Mortality Weekly Report, 73(21), 501-505. https://doi.org/10.15585/mmwr.mm7321e1

Mellis, A. M., Coyle, J., Marshall, K. E., Frutos, A. M., Singleton, J., Drehoff, C., Merced-Morales, A., Pagano, H. P., Alade, R. O., White, E. B., Noble, E. K., Holiday, C., Liu, F., Jefferson, S., Li, Z., Gross, F. L., Olsen, S. J., Dugan, V. G., Reed, C., ... Levine, M. Z. (2024). Serologic evidence of recent infection with highly pathogenic avian influenza A(H5) virus among dairy workers, Michigan and Colorado, June-August 2024. MMWR. Morbidity and Mortality Weekly Report, 73(44), 1004-1009. https://doi.org/10.15585/mmwr.mm7344a3

Uyeki, T. M., Milton, S., Abdul Hamid, C., Reinoso Webb, C., Presley, S. M., Shetty, V., Rollo, S. N., Martinez, D. L., Rai, S., Gonzales, E. R., Kniss, K. L., Jang, Y., Frederick, J. C., De La Cruz, J. A., Liddell, J., Di, H., Kirby, M. K., Barnes, J. R., & Davis, C. T. (2024). Highly pathogenic avian influenza A(H5N1) virus infection in a dairy farm worker. New England Journal of Medicine, 390(21), 2028-2029. https://doi.org/10.1056/NEJMc2405371