The deadly H5N1 strain of avian influenza has reached Australia for the first time, and New Zealand scientists and officials are urging people to stay alert as the virus edges closer to our shores. A second wild bird tested positive for the strain in Western Australia on Monday, confirming that what has become a global wildlife disaster has now arrived in our part of the world.
Until now, New Zealand and Australia were among the last places on Earth untouched by the H5N1 form of the disease, which has swept across every other continent over the past few years and killed hundreds of millions of wild and farmed birds along with seals, sea lions and other mammals. The first Australian case was found in a vagrant migratory seabird on a remote beach in Western Australia, and a second bird has since tested positive, according to reporting by the New Zealand Herald.
For New Zealand the worry is not only farmed poultry but the seabirds, shorebirds and other native species that have no natural immunity to the virus. Many of these birds gather in dense colonies during breeding season, which is exactly the kind of setting where the disease can spread fast and kill in large numbers.
Otago University evolutionary virologist Jemma Geoghegan told RNZ that the global pattern was a clear warning. “We’ve seen internationally that H5N1 has caused major mortality events in wild birds and marine mammals, and many of our native sea birds and other threatened species could be vulnerable when the virus comes here,” she said.
The danger is sharpest for species whose numbers are already tiny. Massey University Distinguished Professor Nigel French said some of the most threatened populations were so small that a single outbreak could wipe them out. “Some of the populations are down to just tens of birds … if it were to get into those populations, it could result in them becoming extinct,” he said.
New Zealand is home to a long list of birds found nowhere else, and several of them survive only in small managed populations or on a handful of predator free islands. A disease that arrives on the wings of migrating birds cannot be stopped at the border the way a pest or a weed can, which is what makes this threat different from most of the biosecurity risks the country usually deals with.
So far the experts are careful to stress what has and has not happened. The virus has not been detected in New Zealand, and the risk to the general public remains low. H5N1 mainly affects birds and some mammals, and human infections overseas have almost always involved people in close and prolonged contact with sick animals. Officials say the most useful thing ordinary people can do is keep their distance from wildlife that looks unwell and report anything unusual.
Biosecurity Minister Andrew Hoggard said the country’s location had been its best defence so far. “Since the H5N1 strain of bird flu started spreading around the world, New Zealand’s geographical isolation has protected us,” he said. That isolation has bought time that other countries did not have, and agencies have used it to plan and to practise.
That practice was not just theoretical. In December 2024 a different high pathogenicity strain, H7N6, broke out at a Mainland Poultry egg farm at Hillgrove in Otago. The Ministry for Primary Industries placed movement controls on the property and the outbreak was contained and stamped out. Geoghegan described that response as a kind of dress rehearsal, with officials using rapid testing and genomic sequencing, drawing on lessons learned during the Covid-19 pandemic, to track how the virus was spreading. The Department of Conservation, the Ministry for Primary Industries and the Ministry of Health have all been working on plans for the day H5N1 turns up here.
The Department of Conservation runs an avian influenza programme aimed squarely at protecting native wildlife, and the Ministry for Primary Industries tests around 2,000 samples from wild birds each year as part of ongoing surveillance. Officials say widespread vigilance from the public is a vital part of that net, because sick birds are often spotted first by people out walking on beaches, around harbours or near wetlands rather than by scientists.
The signs to watch for include birds that appear dehydrated, lethargic or are simply not behaving normally, and clusters of dead or dying birds in one place. People are asked to avoid touching or approaching the animals and to report groups of three or more sick or dead birds or seals to the Ministry for Primary Industries on the exotic pest and disease hotline, 0800 80 99 66. Keeping dogs away from sick or dead wildlife is also sensible, both for the animals’ sake and to avoid spreading anything further.
There are practical steps for anyone who keeps backyard chickens too. Officials advise keeping feed and water where wild birds cannot get to them, limiting contact between domestic flocks and wild birds, and reporting any sudden unexplained deaths among hens. Commercial poultry operations already follow strict biosecurity, and the December 2024 response showed those systems can move quickly when needed.
For now the message from scientists is one of preparation rather than panic. New Zealand has had more warning than almost anywhere else on the planet, and the people whose job it is to protect both farmed animals and native wildlife have spent that time getting ready. Whether the virus arrives this winter, next summer or later, the country is in a far stronger position because it saw the threat coming.
Have you noticed sick or dying birds where you live, or do you keep backyard hens you are now thinking twice about? Share your thoughts in the comments below.
This article was written by AI, briefed to report the facts, hopefully without some of the bias people bring to the job π
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