Highly Pathogenic Avian Influenza Detected in a Multi-Species Backyard Flock in Boone County

What this means

A factual summary is pending editorial review. The complete official release is reproduced below with issuer attribution and a direct link to the original publication.

Official release

Highly Pathogenic Avian Influenza Detected in a Multi-Species Backyard Flock in Boone County

DES MOINES, Iowa (Sept. 22, 2026) - The Iowa Department of Agriculture and Land Stewardship and the United States Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS) have detected a case of Highly Pathogenic Avian Influenza (H5N1 HPAI) in a multi-species backyard flock in Boone County. This case is Iowa’s seventh detection of H5N1 HPAI in 2026.

About H5N1 HPAI in Birds

H5N1 HPAI is a viral disease that affects both wild and domestic bird populations. H5N1 HPAI can travel in wild birds without those birds appearing sick, but is often fatal to domestic bird populations, including chickens and turkeys.

Heightened Biosecurity

The Iowa Department of Agriculture and Land Stewardship is strongly encouraging Iowa poultry producers and backyard flock owners to continue bolstering their biosecurity practices and protocols to protect their flocks. The Department has numerous biosecurity resources to reference on its website.

Suspected Cases in Poultry

If poultry producers or those with backyard birds suspect signs of H5N1 HPAI, they should contact their veterinarian immediately. Possible cases must also be reported to the Iowa Department of Agriculture and Land Stewardship at (515) 281-5305.

Clinical signs of H5N1 HPAI in birds may include:

Sudden increase in bird deaths without any clinical signs

Lethargy and/or lack of energy and appetite

Decrease in egg production

Soft, thin-shelled and/or misshapen eggs

Swelling of the head, eyelids, comb, wattles, and hocks

Purple/blue discoloration of the wattles, comb, and legs

Difficulty breathing

Coughing, sneezing, and/or nasal discharge (runny nose)

Stumbling and/or falling down

Diarrhea

Food Safety

It remains safe to enjoy eggs and poultry products. As a reminder, consumers should always properly handle and cook eggs and poultry products, including cooking to an internal temperature of 165˚F.

Wild and Migratory Birds

The Iowa Department of Natural Resources (DNR) asks those who find 5 to 10 or more sick or dead wild birds in a small area to report their findings to local DNR Wildlife Management staff.

Public Health

The Centers for Disease Control (CDC) continues to believe the threat to the general public remains low. Any questions related to public health should be directed to the Iowa Department of Health and Human Services.

List of Confirmed Cases

As H5N1 HPAI detections are confirmed by the National Veterinary Services Laboratory (NVSL) in Ames, those cases are added to tracking websites located on the USDA APHIS website.

Release text attributed to Iowa Department of Agriculture and Land Stewardship. Consult the official publication for any subsequent corrections or updates.