Highly pathogenic avian influenza (HPAI) was confirmed in a commercial layer flock of about 4.2 million chickens in Sioux County, Iowa, on May 28, 2024. Iowa officials issued a disaster proclamation to support the response through June 27, 2024; their announcement at the time said poultry products remained safe to eat. The available sources do not establish Sioux County’s HPAI status as of October 7, 2026.
Key takeaways
- Iowa officials announced the HPAI detection in commercial layer chickens in Sioux County on May 28, 2024.
- Iowa Capital Dispatch reported that the affected flock contained about 4.2 million egg-laying chickens.
- It was Iowa’s first confirmed HPAI detection in a commercial or backyard poultry flock in 2024 at the time of the report.
- The state disaster proclamation supported tracking and monitoring, rapid detection, containment, disposal, and disinfection. It ran from May 28 through June 27, 2024.
- Iowa’s May 2024 announcement said poultry products remained safe to eat. That was a statement about the situation at the time, not a current 2026 risk assessment.
- The sources reviewed do not establish how the Sioux County flock became infected or the county’s current HPAI status.
What happened to the 4.2 million chickens in Sioux County?
On May 28, 2024, Iowa announced that USDA had confirmed HPAI in commercial layer chickens in Sioux County. Iowa Capital Dispatch reported the flock size as about 4.2 million egg-laying chickens. The reported figure is approximate.
The Iowa Capital Dispatch report said entire flocks are culled to help prevent the disease from spreading. The sources reviewed do not specify the method used at this farm, identify its operator, or establish how the flock became infected.
Where was the Iowa bird-flu detection?
The detection was in Sioux County in northwestern Iowa, at a commercial egg-layer operation. The Iowa Department of Agriculture and Land Stewardship announcement confirmed the county and commercial layer classification.
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| Fact | What the sources report |
|---|---|
| Announcement date | May 28, 2024 |
| Location | Sioux County, Iowa |
| Operation | Commercial layer chickens |
| Reported flock size | About 4.2 million egg-laying chickens, according to Iowa Capital Dispatch |
| Significance at the time | Iowa’s first confirmed commercial or backyard poultry HPAI detection of 2024 |
What did Iowa’s disaster proclamation authorize?
Gov. Kim Reynolds issued a disaster proclamation for Sioux County on May 28, 2024. It made state resources available for tracking and monitoring, rapid detection, containment, disposal, and disinfection, and was effective through June 27, 2024.
The official announcement also said certain regulatory provisions affecting commercial vehicles responding to affected sites were waived. See the governor’s announcement of the proclamation for its scope and dates.
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Was it safe to eat eggs and poultry after the 2024 detection?
Iowa’s May 2024 announcement said the bird detections did not present an immediate public-health concern and that poultry products remained safe to eat. This is the state’s contemporaneous statement about the 2024 event, not a current assessment of disease or food safety in 2026.
The same announcement advised producers who suspected HPAI in their flocks to contact their veterinarian immediately. Readers seeking current public-health or food-safety advice should consult current official guidance.
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What is known about bird flu spread in this event?
Iowa Capital Dispatch described migrating birds as a major driver of the wider outbreak and noted that wild birds can carry the virus without visible signs of illness. That general outbreak context does not establish the route by which the Sioux County flock became infected.
The sources reviewed for this article do not establish Sioux County’s HPAI status as of October 7, 2026. The 2024 detection and the proclamation’s response period should not be read as evidence of a current outbreak.
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Frequently Asked Questions
Which Iowa egg farm was affected by the 2024 Sioux County bird-flu detection?
The official announcement identified a commercial layer operation in Sioux County. The sources reviewed do not name the farm operator, brand, or precise address.
How many chickens were in the Sioux County flock?
Iowa Capital Dispatch reported that the flock contained about 4.2 million egg-laying chickens.
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How were the chickens culled, and how were they disposed of?
The sources reviewed do not identify the specific depopulation or disposal methods used at the Sioux County farm.
Is Sioux County currently affected by bird flu?
The sources reviewed establish a detection announced on May 28, 2024, but do not establish the county’s HPAI status as of October 7, 2026. Check current official animal-health information for present status.
Was it safe to eat poultry products after the 2024 detection?
Iowa’s May 2024 announcement said poultry products remained safe to eat. That historical statement is not a current 2026 risk assessment.
The bottom line
The reported Sioux County event was a historical HPAI detection announced on May 28, 2024, involving a commercial layer flock of about 4.2 million chickens. Iowa’s disaster proclamation supported response activities through June 27, 2024, and the state said poultry products remained safe to eat at the time. The available sources do not establish the county’s current HPAI status.
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