Biosecurity New Zealand has placed strict movement controls on a commercial rural Otago egg farm, the Ministry for Primary Industries reports, after testing confirmed a highly pathogenic strain of avian influenza (HPAI) in chickens that has likely developed from interactions with local waterfowl and wild birds.
“Tests from the Mainland Poultry managed farm have identified a high pathogenic H7N6 subtype of avian influenza. While it is not the H5N1 type circulating among wildlife around the world that has caused concern, we are taking the find seriously,” Biosecurity New Zealand deputy director-general Stuart Anderson, said in the release.
Testing shows it is unrelated to a H7 strain that was identified in Australia earlier this year. Experts believe this case may have occurred as part of a spillover event, where foraging laying hens were exposed to a low pathogenic virus from wild waterfowl.
“Low pathogenic viruses are present in wild birds here, especially waterfowl like ducks, geese, and swans, and the virus can mutate on interaction with chickens,” Anderson said. “It is important to note that the strain found on this farm is not a wildlife adapted strain like H5N1, so we believe it is unlikely to be transmitted to mammals.”
The report says there have been no reports of other ill or dead birds on other poultry farms. There are no human health or food safety concerns, so it is safe to consume thoroughly cooked egg and poultry products, the release said.
Quick action had been taken in co-operation with Mainland Poultry and a restricted place notice issued, Anderson explained in the release.
“Test results late last night confirmed the strain, but we already had restrictions in place and expert biosecurity staff on site, with more arriving today. Mainland Poultry took the right steps by reporting ill birds in one shed on the property and locking that building down as testing continued,” he said. “We will move quickly, with Mainland Poultry, to depopulate birds on the remote property, and we’ve placed a 10-kilometre buffer zone around it alongside the restrictions preventing movement of animals, equipment, and feed. We aim to stamp this out like we did with infectious bursal viral disease that affected chickens in 2019.”
John McKay, chief executive of Mainland Poultry, manages the free-range farm. He says the farm is committed to taking quick action.
“We have been preparing for an event like this for some time, knowing that low pathogenic avian influenza is already present in New Zealand wild birds,” McKay said in the release. “Fortunately, this is not the H5N1 type that has caused concern for wildlife in other parts of the world. International experience with avian influenza has shown us this particular strain (H7N6) can be eradicated quickly and successfully.”
Biosecurity New Zealand will work closely with industry partners to limit possible impacts to trade.
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