USDA Confirms Highly Pathogenic Avian Influenza in a Dairy Herd in Wisconsin

Dec 15, 2025

the U.S. Department of Agriculture’s Animal and Plant Health Inspection Service (APHIS) National Veterinary Services Laboratories (NVSL) confirmed via PCR (polymerase chain reaction) and ELISA (Enzyme-Linked Immunosorbent Assay) assay a detection of highly pathogenic avian influenza (HPAI) H5 clade 2.3.4.4b in a dairy cattle herd in Wisconsin. APHIS will complete genetic sequencing and announce final results as soon as they are available. This confirmation was a result of routine National Milk Testing Strategy testing, not pre-movement surveillance.

This marks the first known case of HPAI in cattle in Wisconsin. While dairy cattle in a total of 18 states have been infected since the start of the outbreak in March 2024, APHIS has seen cases in only a small number of states this year. APHIS is working closely with the Wisconsin Department of Agriculture, Trade, and Consumer Protection to conduct additional on-farm investigations, diagnostic testing, and epidemiological data collection to better understand the detection and prevent further disease spread.

Source : usda.gov

Video: Season 6, Episode 12: Veterinarians’ Perspectives on Managing Swine Herd Health Across All Phases

Identifying challenges in swine production and turning them into solutions through research and team development is the focus of this episode. Dr. Christine Mainquist-Whigham of Pillen Family Farms and DNA Genetics shares insights on herd health, biosecurity and trial work to improve pig performance. She also discusses her team’s research philosophy, how they evaluate rate of investment and how they gather feedback from employees to address challenges and maintain herd health across all phases of production. Dr. Carlos Roudergue of Country View Family Farms discusses the growing complexity of swine production, especially as technology increases and employee interaction decreases. He also shares how their workforce is shifting toward more specialized roles to support herd health and efficiency.