The 2019-2020 flu season is here, and EU and US health authorities predict a busy one. You may recall that 2017 was one of the worst flu seasons in decades and that 2018 was quieter. That’s because seasonal influenza is cyclic. It comes every year but varies in strength. What's happening this time?
The annual flu season runs from October through March in the Northern Hemisphere, though it could start earlier and last longer. In the Southern Hemisphere, it’s the opposite. So I look to Australia during July-August (our summer, and their winter) for clues of how bad our flu season might get, and how effective the flu