September 2026

What the Southern Hemisphere has already told us, what New Mexico did last winter, and how to choose a vaccine The view from the south Flu travels by hemisphere. Australia and New Zealand take their winter while we take our summer, and the viruses that trouble them in July reach us by December. This gives us a few months' warning about which viruses are coming. It tells us nothing, however, about how bad they will be. Forecasting models lose their footing past four weeks, so