Two native New Zealand birds — a brown skua and a kāhu — have died from H5 bird flu in separate locations, and a virologist now cautions that these cases are almost certainly not the full picture. Because both birds were solitary scavengers that contract the virus only by feeding on already-infected carcasses, their deaths imply a broader, unseen chain of infection moving through the landscape. The origin of the virus may never be known, but the more pressing question — how far it has already spread — remains unanswered and urgent.
Expert warns undetected bird flu cases likely circulating in New Zealand
It might be that we never know the actual source.
Mark
Why does it matter that both birds were scavengers?
Mimi
Because scavengers don't catch flu from each other. They catch it from dead birds they eat. So if two scavengers in different places both have it, there must be infected birds out there for them to have found.
Mark
So the virus is already spreading in the wild?
Mimi
Almost certainly. We've only found two birds. But those two birds suggest a chain of infection already happening—one we're not fully seeing.
Mark
Can they trace it back to where it came from?
Mimi
Probably not. The source could be anywhere—remote, hidden, in terrain no one monitors. Geoghegan said they might never know.
Mark
Then what's the point of looking?
Mimi
The point isn't the past. It's the future. If they can detect new cases early and understand how it spreads, they might be able to respond before it becomes something worse.
Mark
Is this a crisis?
Mimi
Not yet. But it's a warning. Two birds is small. But two birds in different places, both scavengers, both infected—that's a pattern that says the problem is bigger than the count shows.
Der Puls
- Two geographically separated scavenger deaths from the same virus suggest a hidden chain of infection already circulating in New Zealand's wild bird population.
- Virologist Jemma Geoghegan warns that official case counts almost certainly underrepresent the true scale, because surveillance cannot reach every remote or inaccessible habitat.
- The source of the virus remains unknown and may stay that way — the infected origin bird or birds could be in terrain where no monitoring exists.
- Authorities face the uncomfortable reality that tracing the outbreak back to its beginning may be impossible, even as the virus continues to move forward.
- The recommended response is a strategic pivot: stop searching for patient zero and concentrate resources on early detection of new cases and mapping transmission patterns.
Two native New Zealand birds — a brown skua and a kāhu — have died from H5 bird flu in separate locations, and a virologist now cautions that these cases are almost certainly not the full picture. Because both birds were solitary scavengers that contract the virus only by feeding on already-infected carcasses, their deaths imply a broader, unseen chain of infection moving through the landscape. The origin of the virus may never be known, but the more pressing question — how far it has already spread — remains unanswered and urgent.
A brown skua washed ashore at Petone Beach in Wellington. Days later, a kāhu was found dead near Carterton in Wairarapa — inland, alone, and infected with the same virus. Both birds tested positive for H5 bird flu. Both are now gone from the wild. The pattern between them is itself the warning.
Jemma Geoghegan, a virologist at Otago University, looked at these two cases and saw more than the official count reflected. Solitary scavengers do not infect one another directly — they contract avian flu by feeding on carcasses of birds already dead from the virus. Two such birds, separated by geography and time, imply that infected birds exist in numbers sufficient to sustain that chain. "It probably suggests that we haven't detected all the cases that are in New Zealand," she said.
The source of the virus remains a mystery. Geoghegan suggested it may be closer than authorities assume, but finding it will be extraordinarily difficult — the original infected bird could be in remote terrain, beyond the reach of any surveillance. "It might be that we never know the actual source," she acknowledged.
What matters now, she argued, is not solving that historical puzzle. The focus should shift to early detection of new cases and understanding how the virus moves through wild bird populations. Surveillance, vigilance, and speed are the tools still available. Finding patient zero, in a landscape this vast and this unmonitored, may simply be a luxury the situation cannot afford.
Two birds, both scavengers, both dead from the same virus. A brown skua washed up on Petone Beach in Wellington. Days later, a kāhu found near Carterton in Wairarapa, inland and alone. Both tested positive for H5 bird flu. Both have now been removed from the wild—one euthanized, the other taken to Palmerston North Hospital. The pattern itself is the warning.
Jemma Geoghegan, a virologist at Otago University, looked at these two cases and saw something the official count did not: evidence of a problem larger than the problem being tracked. Solitary scavengers, she noted, do not typically contract avian flu from each other. They catch it by feeding on carcasses—on birds already dead from the virus. The presence of two such birds, separated by geography and time, suggests a chain of infection already underway in the New Zealand landscape, one that extends beyond what surveillance has so far found.
"It probably suggests that we haven't detected all the cases that are in New Zealand," Geoghegan said. The statement is straightforward, but its implications are not. If two scavengers have independently found infected birds to feed on, then infected birds exist in numbers sufficient to sustain that chain. How many? Where? The answers remain obscured.
The source of the virus itself remains a mystery. Geoghegan suggested it may be closer than authorities might assume—not necessarily distant, not necessarily exotic. But finding it will be extraordinarily difficult. The infected bird or birds could be in remote terrain, in places where no one looks, in habitats where surveillance does not reach. "It might be that we never know the actual source," Geoghegan acknowledged. The virus arrived in New Zealand somehow, but the moment and mechanism of its arrival may remain forever unknown.
What matters now, she argued, is not solving that historical puzzle but preventing the next one. The focus should shift to early detection of new cases as they emerge, and to understanding how the virus moves through the wild bird population. These are the questions that can still be answered, the ones that might actually change what happens next. Surveillance, vigilance, and speed—these are the tools available. Finding patient zero is a luxury the situation may not afford.
Bemerkenswerte Zitate
It probably suggests that we haven't detected all the cases that are in New Zealand.— Jemma Geoghegan, Otago University virologist
It might be that we never know the actual source.— Jemma Geoghegan
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