New Zealand detects H5N1 in native bird and begins emergency vaccinations

New Zealand has confirmed its first case of the H5N1 bird flu strain in a native bird, marking a significant escalation in the country’s biosecurity challenges. The infection was detected in a swamp harrier hawk, known locally as a kahu, in the North Island’s Wairarapa region, following earlier confirmation of the virus in a brown skua seabird near Wellington. Authorities have initiated a vaccination program targeting 300 core breeding birds from five of the nation’s most endangered species, including the flightless takahe and kakapo, as they grapple with the potential risks to New Zealand’s unique wildlife.

First Detection in Native Bird

The discovery of H5N1 in the kahu follows the initial detection of the virus in a brown skua on Petone Beach in Wellington, which was confirmed on July 15. Biosecurity Minister Andrew Hoggard described the presence of the strain in a native bird as “not unexpected” given the earlier case, though he acknowledged the concern it raises for New Zealand’s ecosystem. “This hawk can go out to the coast, especially in winter to hunt. Hawks can get bird flu by hunting, eating, or scavenging infected birds,” he stated, highlighting the risk of transmission through natural behaviors.

Officials emphasized that there is no evidence of mass mortality in wildlife or transmission between wild birds, and no cases have been detected in poultry. Hoggard reiterated that the virus poses a low risk to humans unless there is direct, prolonged contact with large numbers of sick birds. “The situation is being closely monitored, but at this stage there is no evidence of any illness beyond this seabird,” he said, noting that surveillance efforts continue along the coastline.

Vaccination Program for Endangered Species

In response to the threat, health officials have launched a vaccination campaign for 300 core breeding birds from five critically endangered species. The program includes the takahe, kakapo, tchūriwat’/tūturuatu (shore plovers), kakī (black stilts), and kākāriki karaka (orange-fronted parakeets). These species, many of which are already in precarious population numbers, are considered particularly vulnerable due to their evolutionary isolation. New Zealand’s native birds evolved without exposure to land mammals, leaving them poorly equipped to defend against new pathogens like H5N1.

Brett Gartrell, a professor of wildlife health at Massey University, expressed concerns that the virus could push some species to extinction. “Our birds have never had to deal with anything like this before,” he said. “If it spreads quickly in New Zealand, we could be in trouble… those core group of birds that officials want to protect with the vaccination won’t be fully immune if it spreads too quickly.” The vaccination trials, conducted in 2025, showed no adverse effects, but officials caution that effectiveness remains uncertain without exposure to the virus.

The Ministry for Primary Industries (MPI) and the Department of Conservation (DoC) have been preparing for the arrival of H5N1 for years. Hoggard highlighted that New Zealand’s biosecurity measures, including collaboration with the poultry industry, have positioned the country to respond effectively. “We’ve had that preparation well in place and have been doing a lot of work with the poultry sector,” he said. “In terms of being prepared, we’re as prepared as we possibly can be.”

Despite these efforts, the situation remains uncertain. Australia, which detected its first H5N1 case in a local seabird earlier this month, has seen isolated detections without widespread outbreaks. Hoggard suggested New Zealand could follow a similar pattern, but warned that the country’s unique biodiversity complicates predictions. “Our unique birdlife and marine mammals make it difficult to predict how the virus might behave if it spreads,” he said.

The public has been urged to report any sightings of three or more sick or dead wild birds to MPI. Wellington Zoo has also implemented restrictions, including halting admissions of injured birds and suspending close encounters with kororā (little blue penguins). Officials stress that the risk to humans remains low, but vigilance is critical to prevent the virus from spreading to vulnerable populations.

As New Zealand navigates this unprecedented challenge, the focus remains on balancing precaution with the realities of a global health crisis. With the virus now present in native birds, the coming weeks will test the effectiveness of biosecurity measures and the resilience of the nation’s ecosystems.