H5N1 Bird Flu Highly Pathogenic Avian Influenza Highly Pathogenic Avian Influenza (HPAI) Transmission Public Health Precautions H5N1 Virus Symptoms H5N1 Strain Prevention Spread Zoonotic Diseases Poultry Biosecurity Measures Cattle Human Risks Pathogenic Avian Influenza Immune System Virus Mutations HPAI H5N1 Outbreak Transmission Risk Bird Flu Outbreaks High Pathogenicity Avian Influenza (HPAI) H5N1 Alpacas Human Case Human Exposure Strains of Influenza Public Health Concerns Impact on Agriculture Newcastle Disease Highly Pathogenic Bird Flu HPAI