This is a comprehensive guide to understanding influenza - or the flu as it is more commonly known. There are various forms of this viral infection and how a patient reacts to it will depend upon their age, fitness and overall health. We attempt to answer all your flu related questions as to how long it lasts and incubation periods. Also how best to cope when you or a member of your household is suffering from one of the various strains - and how to recognize which one it is. But we also take a look at how to prevent the flu through vaccination, germ prevention and general healthy living.