 You can learn more at nutrientagsolutions.com. HPAI, or highly pathogenic avian influenza, which has been spreading in the poultry industry for two and a half years, is now a growing concern in the dairy sector, prompting fresh research into how the virus impacts cattle. A new study by researchers at Iowa State University's College of Veterinary Medicine has revealed why highly pathogenic avian influenza is being detected in raw milk from infected dairy herds.