Delayed Flu Season Could Bring More Cases

After Winter

September 2026 South Australia's health experts say an unusual flu season could lead to increased cases even after the traditional winter peak. Chief Public Health Officer Professor Nicola Spurrier said flu numbers have only recently started rising in the state, despite it already being August. “We’ve had an unusual year because we’re only now seeing flu numbers increase,” she said. Professor Spurrier believes the delayed rise may be linked to last year’s atypical flu season. While cases peaked during winter as expected, a second wave emerged in October and continued into summer. She said the northern hemisphere subclade K strain, known as the “Super K” strain, contributed to that surge. Adelaide GP Dr Daniel Byrne said flu activity this winter has been significantly lower than in previous years, estimating case numbers at about one-tenth of normal levels. He said changing patterns of international travel and the global movement of viruses may be influencing when influenza circulates in Australia. “The world is changing,” Dr Byrne said. “We may now be seeing more flu during our summer, which is very different from what we experienced 15 to 20 years ago.” He warned that South Australia could face a late flu season and encouraged people to get vaccinated. “It’s still not too late to get your flu shot because the flu could still be coming later this year,” he said. While flu cases remain relatively low, other respiratory illnesses are placing pressure on healthcare services. Dr Byrne said rhinovirus, the virus responsible for the common cold, is currently the most common illness being seen by doctors, followed by respiratory syncytial virus (RSV). South Australia has recorded 5,702 RSV cases so far this year. The highly contagious virus is a leading cause of hospitalisation among young babies. Dr Byrne has called for broader access to free RSV vaccination. Pregnant women have been eligible for a free RSV vaccine under the National Immunisation Program since February 2025, while newborns without maternal protection can receive the monoclonal antibody nirsevimab through state and territory programs. Adults aged over 75 became eligible for a free RSV vaccine in May, and Western Australia has expanded access to residents aged 65 and over in aged care facilities. Dr Byrne said he would like South Australia to adopt a similar approach. Professor Spurrier said health authorities will continue monitoring RSV trends and compare results with other states before considering future policy changes.

Greek Tribune Adelaide, South Australia