Immunity Boosters in the age of killer viruses

This is how I was taught to deal with viral infections (growing up in India, you encounter more than your fair share of such infections).

Day Zero — The instant you feel a sore throat ( or body ache or a slight fever), and suspect an infection, blanket yourself up. Take a paracetmol (tylenol in the U.S.) and bundle yourself up. This will raise your body temperature. Granted it is uncomfortable for a couple of hours — but this simple act, in itself, will take care of a LOT of viruses. Most viruses have a hard time surviving high body temperatures.