Compromised immune systems, that's where it begins! And I suspect that is due to the rash legal and illegal immigration, combined with drug abuse. I haven't had a flu shot since the mid 90's, and have only had the flu once, since, due to an unusual circumstance. So no, not everyone needs them, but if YOUR immune system IS compromised, due us all a favor, stay out of the general population until your well. Most flu virus's are SPREAD by contact, by people who should be home in bed dealing with it, and if you have it, its to late to see a doctor, it has to run its course, common sense is the key, AND WE ALL KNOW HOW SHORT THAT IS RUNNING ON SUPPLY!