Wisconsin - Avian influenza in wild birds 2023-2026

[Pathfinder]

Detections of Highly Pathogenic Avian Influenza in Wild Birds

Last Modified: September 24, 2025
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State County Collection Date Date Detected HPAI Strain Bird Species WOAH Classification Sampling Method

Wisconsin	Dane	9/12/2025	9/18/2025	EA H5	Canada goose	Wild bird	Morbidity/Mortality
Wisconsin	La Crosse	9/4/2025	9/18/2025	EA H5	American white pelican	Wild bird	Morbidity/Mortality
Wisconsin	La Crosse	9/4/2025	9/18/2025	EA H5	American white pelican	Wild bird	Morbidity/Mortality
Wisconsin	Pierce	9/8/2025	9/17/2025	EA H5	Peregrine falcon	Wild bird	Morbidity/Mortality

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https://www.aphis.usda.gov/livestock-poultry-disease/avian/avian-influenza/hpai-detections/wild-birds

[Pathfinder]

Detections of Highly Pathogenic Avian Influenza in Wild Birds
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State County Collection Date Date Detected HPAI Strain Bird Species WOAH Classification Sampling Method

Wisconsin

Sauk

9/18/2025

9/24/2025

EA H5

Whooping crane

Captive wild bird

Morbidity/Mortality

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https://www.aphis.usda.gov/livestock-poultry-disease/avian/avian-influenza/hpai-detections/wild-birds

[Pathfinder]

Detections of Highly Pathogenic Avian Influenza in Wild Birds

Last Modified: October 14, 2025
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State County Collection Date Date Detected HPAI Strain Bird Species WOAH Classification Sampling Method

Wisconsin	Pierce	10/5/2025	10/10/2025	EA H5	Bald eagle	Wild bird	Morbidity/Mortality
Wisconsin	Burnett	9/28/2025	10/8/2025	EA H5	Mallard	Wild bird	Hunter harvest

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https://www.aphis.usda.gov/livestock-poultry-disease/avian/avian-influenza/hpai-detections/wild-birds

[Pathfinder]

Detections of Highly Pathogenic Avian Influenza in Wild Birds
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State County Collection Date Date Detected HPAI Strain Bird Species WOAH Classification Sampling Method

Wisconsin	Milwaukee	9/24/2025	10/20/2025	EA H5	Mallard	Wild bird	Morbidity/Mortality
Wisconsin	Jefferson	10/4/2025	10/14/2025	EA H5	Blue-winged teal	Wild bird	Hunter harvest
Wisconsin	Jefferson	10/4/2025	10/14/2025	EA H5	Northern shoveler	Wild bird	Hunter harvest
Wisconsin	Jefferson	10/4/2025	10/14/2025	EA H5	Mallard	Wild bird	Hunter harvest
Wisconsin	Jefferson	10/4/2025	10/14/2025	EA H5	Mallard	Wild bird	Hunter harvest
Wisconsin	Jefferson	10/4/2025	10/14/2025	EA H5	Mallard	Wild bird	Hunter harvest
Wisconsin	Jefferson	10/4/2025	10/14/2025	EA H5	Mallard	Wild bird	Hunter harvest
Wisconsin	Jefferson	10/4/2025	10/14/2025	EA H5	Mallard	Wild bird	Hunter harvest
Wisconsin	Jefferson	10/4/2025	10/14/2025	EA H5	Mallard	Wild bird	Hunter harvest

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https://www.aphis.usda.gov/livestock-poultry-disease/avian/avian-influenza/hpai-detections/wild-birds

[Pathfinder]

Detections of Highly Pathogenic Avian Influenza in Wild Birds

Last Modified: November 12, 2025
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State County Collection Date Date Detected HPAI Strain Bird Species WOAH Classification Sampling Method

Wisconsin	Pierce	10/21/2025	11/5/2025	EA H5	Peregrine falcon	Wild bird	Morbidity/Mortality
Wisconsin	Pierce	10/23/2025	11/5/2025	EA H5	Canada goose	Wild bird	Morbidity/Mortality
Wisconsin	St. Croix	10/18/2025	10/27/2025	EA H5	Canada goose	Wild bird	Morbidity/Mortality

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https://www.aphis.usda.gov/livestock-poultry-disease/avian/avian-influenza/hpai-detections/wild-birds

[Pathfinder]

Detections of Highly Pathogenic Avian Influenza in Wild Birds

Last Modified: November 25, 2025
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State County Collection Date Date Detected HPAI Strain Bird Species WOAH Classification

Wisconsin	Burnett	11/8/2025	11/20/2025	EA H5	Wood duck	Wild bird
Wisconsin	Burnett	11/8/2025	11/20/2025	EA H5	Redhead duck	Wild bird
Wisconsin	Burnett	11/8/2025	11/20/2025	EA H5	Northern pintail	Wild bird
Wisconsin	Burnett	11/8/2025	11/20/2025	EA H5	Mallard	Wild bird

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https://www.aphis.usda.gov/livestock-poultry-disease/avian/avian-influenza/hpai-detections/wild-birds

[Pathfinder]

Detections of Highly Pathogenic Avian Influenza in Wild Birds

Last Modified: December 02, 2025
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State County Collection Date Date Detected HPAI Strain Bird Species WOAH Classification Sampling Method

Wisconsin	Oconto	11/8/2025	11/21/2025	EA H5	Lesser scaup	Wild bird	Hunter harvest
Wisconsin	Oconto	11/8/2025	11/21/2025	EA H5	Lesser scaup	Wild bird	Hunter harvest
Wisconsin	Oconto	11/8/2025	11/21/2025	EA H5	Lesser scaup	Wild bird	Hunter harvest
Wisconsin	Oconto	11/8/2025	11/21/2025	EA H5	Lesser scaup	Wild bird	Hunter harvest
Wisconsin	Oconto	11/8/2025	11/21/2025	EA H5	Lesser scaup	Wild bird	Hunter harvest

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https://www.aphis.usda.gov/livestock-poultry-disease/avian/avian-influenza/hpai-detections/wild-birds

[Pathfinder]

Detections of Highly Pathogenic Avian Influenza in Wild Birds

Last Modified: December 09, 2025
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State County Collection Date Date Detected HPAI Strain Bird Species WOAH Classification Sampling Method

Wisconsin	Burnet	11/21/2025	12/8/2025	EA H5	Ring-necked duck	Wild bird	Hunter harvest
Wisconsin	Burnet	11/21/2025	12/8/2025	EA H5	Ring-necked duck	Wild bird	Hunter harvest
Wisconsin	Burnet	11/21/2025	12/8/2025	EA H5	Mallard	Wild bird	Hunter harvest
Wisconsin	Brown	11/15/2025	12/4/2025	EA H5	Greater scaup	Wild bird	Hunter harvest
Wisconsin	Brown	11/15/2025	12/4/2025	EA H5	Greater scaup	Wild bird	Hunter harvest
Wisconsin	Oconto	11/14/2025	12/4/2025	EA H5	Mallard	Wild bird	Hunter harvest
Wisconsin	Oconto	11/14/2025	12/4/2025	EA H5	Mallard	Wild bird	Hunter harvest
Wisconsin	Oconto	11/13/2025	12/4/2025	EA H5	Mallard	Wild bird	Hunter harvest
Wisconsin	Oconto	11/13/2025	12/4/2025	EA H5	Lesser scaup	Wild bird	Hunter harvest
Wisconsin	Oconto	11/18/2025	12/4/2025	EA H5	Mallard	Wild bird	Hunter harvest

Wisconsin	Vernon	11/16/2025	12/4/2025	EA H5	Mallard	Wild bird	Hunter harvest
Wisconsin	Brown	11/16/2025	12/4/2025	EA H5	Greater scaup	Wild bird	Hunter harvest
Wisconsin	Brown	11/16/2025	12/4/2025	EA H5	Greater scaup	Wild bird	Hunter harvest
Wisconsin	Brown	11/16/2025	12/4/2025	EA H5	Greater scaup	Wild bird	Hunter harvest
Wisconsin	Brown	11/16/2025	12/4/2025	EA H5	Greater scaup	Wild bird	Hunter harvest
Wisconsin	Brown	11/16/2025	12/4/2025	EA H5	Bufflehead	Wild bird	Hunter harvest
Wisconsin	Oconto	11/18/2025	12/4/2025	EA H5	Mallard	Wild bird	Hunter harvest
Wisconsin	Brown	11/16/2025	12/4/2025	EA H5	Common merganser	Wild bird	Hunter harvest

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https://www.aphis.usda.gov/livestock...ons/wild-birds

[Pathfinder]

Detections of Highly Pathogenic Avian Influenza in Wild Birds

Last Modified: December 02, 2025
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State County Collection Date Date Detected HPAI Strain Bird Species WOAH Classification Sampling Method

Wisconsin	Oconto	11/8/2025	11/21/2025	EA H5	Lesser scaup	Wild bird	Hunter harvest
Wisconsin	Oconto	11/8/2025	11/21/2025	EA H5	Lesser scaup	Wild bird	Hunter harvest
Wisconsin	Oconto	11/8/2025	11/21/2025	EA H5	Lesser scaup	Wild bird	Hunter harvest
Wisconsin	Oconto	11/8/2025	11/21/2025	EA H5	Lesser scaup	Wild bird	Hunter harvest
Wisconsin	Oconto	11/8/2025	11/21/2025	EA H5	Lesser scaup	Wild bird	Hunter harvest

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https://www.aphis.usda.gov/livestock...ons/wild-birds

2 cases in Oconto have now been identified as H5N5:


Detections of Highly Pathogenic Avian Influenza in Wild Birds

Last Modified: December 16, 2025

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https://www.aphis.usda.gov/livestock...ons/wild-birds

[Pathfinder]

Detections of Highly Pathogenic Avian Influenza in Wild Birds

Last Modified: December 16, 2025

State County Collection Date Date Detected HPAI Strain Bird Species WOAH Classification Sampling Method

Wisconsin

Brown

12/1/2025

12/12/2025

EA H5

White-winged scoter

Wild bird

Hunter harvest

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https://www.aphis.usda.gov/livestock-poultry-disease/avian/avian-influenza/hpai-detections/wild-birds

[Pathfinder]

Detections of Highly Pathogenic Avian Influenza in Wild Birds

Last Modified: December 23, 2025
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State County Collection Date Date Detected HPAI Strain Bird Species WOAH Classification

Wisconsin	St. Croix	12/5/2025	12/18/2025	EA H5	Canada goose	Wild bird
Wisconsin	Dane	12/7/2025	12/17/2025	EA H5	Tundra swan	Wild bird
Wisconsin	Jefferson	12/6/2025	12/17/2025	EA H5	Tundra swan	Wild bird
Wisconsin	Kewaunee	11/30/2025	12/16/2025	EA H5	Canada goose	Wild bird

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https://www.aphis.usda.gov/livestock-poultry-disease/avian/avian-influenza/hpai-detections/wild-birds

[Pathfinder]

Detections of Highly Pathogenic Avian Influenza in Wild Birds

Last Modified: January 21, 2026
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State County Collection Date Date Detected HPAI Strain Bird Species WOAH Classification Sampling Method

Wisconsin

St. Croix

1/11/2026

1/16/2026

EA H5

Canada goose

Wild bird

Morbidity/Mortality

...

https://www.aphis.usda.gov/livestock-poultry-disease/avian/avian-influenza/hpai-detections/wild-birds

[Pathfinder]

Detections of Highly Pathogenic Avian Influenza in Wild Birds

Last Modified: January 28, 2026
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State County Collection Date Date Detected HPAI Strain Bird Species WOAH Classification Sampling Method

Wisconsin	Milwaukee	1/13/2026	1/23/2026	EA H5	Canada goose	Wild bird	Morbidity/Mortality
Wisconsin	Dane	1/12/2026	1/22/2026	EA H5	Red-tailed hawk	Wild bird	Morbidity/Mortality

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https://www.aphis.usda.gov/livestock-poultry-disease/avian/avian-influenza/hpai-detections/wild-birds

[Pathfinder]

Detections of Highly Pathogenic Avian Influenza in Wild Birds

Last Modified: February 03, 2026

State County Collection Date Date Detected HPAI Strain Bird Species WOAH Classification Sampling Method

Wisconsin	Dane	1/6/2026	1/26/2026	EA H5	American crow	Wild bird	Morbidity/Mortality
Wisconsin	Dane	12/24/2025	1/26/2026	EA H5	American crow	Wild bird	Morbidity/Mortality
Wisconsin	Wood	1/7/2026	1/26/2026	EA H5	Canada goose	Wild bird	Morbidity/Mortality
Wisconsin	Wood	1/7/2026	1/26/2026	EA H5	Canada goose	Wild bird	Morbidity/Mortality
Wisconsin	Wood	1/7/2026	1/26/2026	EA H5	Canada goose	Wild bird	Morbidity/Mortality

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https://www.aphis.usda.gov/livestock-poultry-disease/avian/avian-influenza/hpai-detections/wild-birds

[Pathfinder]

Detections of Highly Pathogenic Avian Influenza in Wild Birds

Last Modified: February 11, 2026
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State County Collection Date Date Detected HPAI Strain Bird Species WOAH Classification Sampling Method

Wisconsin	Shawano	12/16/2025	2/3/2026	EA H5	Canada goose	Wild bird	Morbidity/Mortality
Wisconsin	Walworth	1/6/2026	2/3/2026	EA H5	Canada goose	Wild bird	Morbidity/Mortality
Wisconsin	Walworth	1/6/2026	2/3/2026	EA H5	Canada goose	Wild bird	Morbidity/Mortality
Wisconsin	St. Croix	1/26/2026	2/3/2026	EA H5	Canada goose	Wild bird	Morbidity/Mortality
Wisconsin	Shawano	12/16/2025	2/2/2026	EA H5	Bald eagle	Wild bird	Morbidity/Mortality
Wisconsin	Juneau	11/25/2025	2/2/2026	EA H5	Snowy owl	Wild bird	Morbidity/Mortality
Wisconsin	Oneida	11/12/2025	2/2/2026	EA H5	Trumpeter swan	Wild bird	Morbidity/Mortality
Wisconsin	Marathon	10/24/2025	2/2/2026	EA H5	Bald eagle	Wild bird	Morbidity/Mortality
Wisconsin	Winnebago	10/22/2025	2/2/2026	EA H5	Great horned owl	Wild bird	Morbidity/Mortality

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https://www.aphis.usda.gov/livestock-poultry-disease/avian/avian-influenza/hpai-detections/wild-birds