The fast-spreading influenza K strain is expected to be an “important player” this flu season, with one expert urging Kiwis not to forget basic precautions learned during Covid. 

Health officials have been monitoring the H3N2 subclade K influenza virus, also dubbed “Super-K”, after it became dominant across parts of the United States, Asia and Europe late last year. 

Though it is not considered more severe, the strain is thought to be more transmissible than typical seasonal flu. 

As of last week, the K strain made up 53 out of 61 flu samples tested in New Zealand, according to the NZ Institute for Public Health and Forensic Science. 

Principal medical adviser at the University of Auckland’s Immunisation Advisory Centre, Dr Nikki Turner, said the strain was already circulating in New Zealand toward the end of last winter. 

University of Auckland Immunisation Advisory Centre principal medical adviser Dr Nikki Turner. Photo / Supplied 

“We are expecting it to be an important player in the flu season this year. 

“As yet, we have pretty low rates of flu but we are watching closely for the onset of the season which could come any time.” 

New Zealand was better positioned than Northern Hemisphere countries were last year, with a closer match between circulating strains and this year’s flu vaccine, Turner said. 

“Basically, everyone watch out – the difference this year is we’re not just worried about flu coming earlier, it’s that we have a mix of viruses.” 

Health NZ public health medicine specialist Dr Richard Vipond said people should get their yearly flu vaccine ahead of the peak season, usually between June and September. 

“All 2026 flu vaccines in New Zealand contain Southern Hemisphere updates to the super-K-flu as well as coverage for other anticipated influenza strains for this season.” 

Around 500 people die from influenza every year in New Zealand, according to Health NZ. Photo / 123rf 

Around 500 people in New Zealand die from influenza each year in New Zealand, with vulnerable groups, including older adults, pregnant women, and those with underlying conditions, most at risk. 

Health NZ advises people with symptoms, who live in crowded households, to isolate where possible in a well-ventilated space. 

Turner said simple public health measures could also help limit the spread. 

People should wear masks on public transport or in busy indoor spaces, especially if they were at higher risk, and to stay home if experiencing symptoms such as coughs or runny noses, she said. 

“Let’s not forget what we learned through Covid, we can reduce the spread of these viruses. 

“For those that can, stay at home when you’re sick, wear masks, use sanitiser.”