Virulent Newcastle Disease Outbreak USDA Additional Cases of Virulent Newcastle Disease in Backyard Poultry in California Increase the Need for Backyard Owners to Be Vigilant about Biosecurity USDA Confirms Virulent Newcastle Disease in Backyard Exhibition Birds in Los Angeles, California, Not a Food Safety Concern USDA’s Virulent Newcastle Disease Factsheet USDA’s Biosecurity for Birds USDA’s Signs of Illness in Poultry AFA’s Statement of Biosecurity against Avian influenza, Viruses and Diseases
