Serious seasonal respiratory illnesses, including influenza and Respiratory Syncytial Virus (RSV), continue to circulate at high levels in parts of New Zealand as we head into spring.
The New Zealand Institute for Public Health and Forensic Science (PHF Science) operates the country’s national respiratory illness surveillance systems on behalf of the Public Health Agency and publishes weekly updates on its public dashboard.
“Our surveillance systems are showing that as of the end of August, New Zealand is experiencing a late peak in seasonal respiratory illness in the community, and indicators show this is currently particularly affecting the South Island.” says PHF Science Public Health Physician Dr Sarah Jefferies.
Typically, the influenza season runs from May to October. In recent years, following the COVID-19 pandemic, respiratory illness has peaked early, in June or July. “This year, however, weekly reports of community influenza-like illness have risen steadily since May and are still climbing into late August,” says Dr Jefferies. “While this is later than recent years, weekly rates remain below the national peaks recorded between 2022 and 2024.”
Healthline data shows influenza-like illness rates in Te Waipounamu (South Island) have risen above the national average, reaching levels not seen since the COVID-19 Omicron community wave in 2022. Laboratory surveillance indicates that influenza and RSV are driving much of this activity.
Dr Jefferies urges people to stay vigilant and up to date with vaccinations. “This year’s burden is being driven by multiple viruses, particularly two strains – influenza A (H1N1) and B viruses – alongside a prolonged RSV season and ongoing COVID-19 spread. These influenza viruses can hit young people harder, but even healthy adults can become seriously unwell. The good news is that this year’s seasonal influenza vaccine is a good match to the strains circulating and will provide strong protection.”
She emphasises prevention remains key: “Staying up to date with your routine and annual immunisations, like the flu vaccine, is our best defence against severe illness.”
As viruses continue to circulate at high levels, New Zealanders are encouraged to take simple steps to protect themselves and others: stay home if you’re sick, cover coughs and sneezes, wash and dry your hands well, and seek advice if unwell from Healthline or your doctor. Further guidance, including how to access the flu vaccine, is available on the Health New Zealand website.