Australia Confirms First H5N1 Bird Flu Case in Sydney

CSIRO scientists at the Australian Centre for Disease Preparedness confirmed the first case of highly pathogenic H5N1 avian influenza in Australia after testing a sick migratory bird.

Genome sequencing identified the virus as the 2.3.4.4b clade, matching the strain previously detected in sub-Antarctic animals, allowing officials to assess biosecurity risks within 12 hours.

The confirmation process involved comparing the virus's genetic code against reference samples to determine its genotype, severity, and potential for drug resistance to guide government response strategies.