Mark Dain Don't people have defenses for the common cold / flu / whatever in their immune system? My head is on fire after this illness started going around the office

Simon Janes Proactive Vitamin D and Zinc supplements in winter. Take them all winter long as insurance against these things.

Martijn We don't, because it mutates to quickly, if I recall correctly. So, yes, you are probably immune to yesteryear's flu. But you are still fucked for 2016.