Each year, influenza reminds us that nature resists the calendars we impose upon it. Australia's 2026 flu season arrived quietly, then surged — cases climbing 27 percent in a fortnight by early September, driven by the H3N2 'super K' strain that defied the country's familiar winter rhythm. In the years since the pandemic dissolved old patterns of immunity and behavior, influenza has become less a seasonal certainty and more an open question — one that health authorities are urging Australians, particularly the vulnerable, to answer with vaccination while the window remains.