To date, USDA’s National Veterinary Services Laboratories has confirmed the presence of Highly Pathogenic Avian Influenza (HPAI) in commercial and backyard flocks in several states including South Dakota. Avian influenza viruses are classified as either “low pathogenic (LPAI)” or “highly pathogenic (HPAI)” based on their genetic features and the severity of the disease they cause in p...
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