The Wisconsin Veterinary Diagnostic Laboratory was activated in 2022 to help the state monitor and track the disease, testing samples from poultry and wild birds across the state. Since then, scientists there have continued running surveillance year-round as detections rise and fall with migration seasons.
“Since then, we’ve lost several hundred million birds,” said Dr. Keith Poulsen, director of the Wisconsin Veterinary Diagnostic Laboratory. “It changes a little bit. Flu changes all the time, right? But this is still considered really the same outbreak that started in 2022. And it’s the biggest foreign animal disease outbreak in U.S. history.”