Update on HPAI/H5N1 in Dairy Cattle
HPAI/H5N1 Cases in Wisconsin
In December, the Wisconsin Department of Agriculture, Trade and Consumer Protection (DATCP) identified three cases of highly pathogenic avian influenza (HPAI H5N1) in poultry flocks. Nationally, the U.S. Department of Agriculture (USDA) has confirmed 36 cases of H5N1 in livestock in four states in the last 30 days. Access the map of livestock detections.
New Strain Detection in Dairy Cattle
This month, USDA APHIS notified DATCP of a new genotype of HPAI (H5N1) detected in dairy cattle in Nevada and Arizona. This new strain, genotype D1.1, originated from wild migratory birds. Wisconsin has not detected HPAI in dairy cattle. DATCP will continue to monitor this new strain as more information becomes available.
H5N1 Protocol: What To Do if H5N1 Is Confirmed on Your Dairy Farm
DATCP has created a document for industry in case of a detection of H5N1 on a dairy farm. The document is intended to serve as a general reference for industry, but individual needs and response actions may differ for H5N1 detections, depending on the operation and specific circumstances. Access the H5N1 Protocol: What To Do if H5N1 Is Confirmed on Your Dairy Farm document.
Wisconsin and the National Milk Testing Strategy
On December 6, 2024, the U.S. Department of Agriculture’s (USDA) Animal and Plant Health Inspection Service (APHIS) announced the start of its National Milk Testing Strategy (NMTS). The NMTS builds on measures taken by USDA and federal and state partners since H5N1 was first detected in dairy cattle in March 2024.
Wisconsin has worked with state and federal partners to find a testing strategy that fits the state's unique dairy industry. Today, Wisconsin is announcing participation in the NMTS. Details on testing will be forthcoming, but at this time, DATCP expects to utilize samples that are already collected for routine milk testing to streamline the testing process.
Biosecurity and Monitoring
- Producers should continue to enhance biosecurity and monitor disease in their herds.
- Report herds with unexplained symptoms to DATCP at (608) 224-4872 (business hours) or (800) 943-0003 (after hours and weekends).
April 24 Federal Order
Wisconsin Requirements
Biosecurity Tips for Upcoming Events
With fairs, shows, and dairy breakfasts approaching, it's important to emphasize biosecurity:
- Enhance biosecurity measures and monitor disease in your herds.
- Report herds with unexplained symptoms to DATCP at (608) 224-4872 (business hours) or (800) 943-0003 (after hours and weekends).
- Visit the new DATCP webpage for event organizers for resources.
Human Health Precautions
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Human cases of H5N1 have been reported following exposure to infected animals.
- Wisconsin Department of Health Services (DHS) advises those working with animals to take precautions and wear PPE per CDC guidance.
- According to the Centers for Disease Control and Prevention (CDC), the public health risk from H5N1 detections remains low.
Food Safety
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