If you’re an infectious disease geek — and who isn’t these days? — you may have noticed that the Centers for Disease Control and Prevention (CDC) have not sent out any alerts over influenza this influenza season. (In the United States, influenza season is from October to May.) In fact, if you look at CDC’s influenza surveillance reports, it seems that influenza has all but disappeared. You can even drill-down on the data further and see that influenza is active at very low levels across all age groups. So where has influenza gone?