Australia’s Bird Flu Outbreak Enters “Mass Mortality” Phase as H5N1 Spreads to Seagulls
N authorities have admitted they cannot halt the advance of H5N1 through the country's wild bird populations, as fresh infections now total 53 cases...
Australian authorities have admitted they cannot halt the advance of H5N1 through the country's wild bird populations, as fresh infections now total 53 cases nationwide and the first seagull has tested positive for the virus.
The acknowledgment marks a turning point. Officials expect widespread animal deaths.
South Australia is emerging as a hotspot. Aerial teams recovered more than 80 sick and dead greater crested terns from Baudin Rock, an island roughly eight kilometres offshore near Robe. State chief veterinary officer Skye Freuan said the cluster likely represents the nation's first wildlife mass mortality event tied to the disease since it was detected in Western Australia in June.
"This is escalating quite rapidly," Freuan told reporters on Saturday. "We can't stop the spread once it gets into wildlife; at some point in time, we were likely to see large numbers of sick or dead animals."
The Seagull Breakthrough
The discovery of H5N1 in a silver gull—a common coastal bird species found across Australia—signals the virus has breached a critical boundary. Until now, confirmed cases had been confined to marine and migratory species. Seagulls are ubiquitous near human settlements and food sources, potentially widening infection pathways.
Six additional cases are suspected in Victoria. The federal Department of Agriculture, Fisheries and Forestry confirmed that 20 birds from Kangaroo Island and South Australia's southeast coast tested positive in the latest round of testing.
A suspected infected bird was also found near an open-range zoo in Monarto, less than an hour's drive east of Adelaide, raising biosecurity concerns for captive animal facilities.
Industry Anxiety and Economic Risk
Human infection risk remains low. The real alarm bells are ringing in the poultry sector.
Just two years ago, a different strain of avian influenza forced authorities to cull 2 million chickens, creating severe egg supply disruptions. Experts worry a repeat scenario could devastate Australia's food production and export markets if the current outbreak spreads to commercial farms.
Freuan noted the virus is now circulating among resident birds—crested terns and seagulls—suggesting sustained local transmission rather than isolated events. More wildlife deaths are expected as H5N1 continues moving through susceptible populations.
