[West Ender]

I had a flu jab 2 weeks ago with absolutely no ill effects but what I, as a lay person, don't understand is how the vaccine can protect you against all the different flu viruses. There are so many strains of flu, some of them mutating from earlier viruses, that I can't see how they can all be covered. If the vaccine only protects the lungs against viral infection of any sort, why is there a separate pneumonia vaccine?

Colds are a different matter. It annoys me when someone has a heavy, feverish cold and says they've got flu, when you have real flu you appreciate the difference.