FLU (INFLUENZA) The Ultimate Guide To Preventing Contagious Cold And Flu (Influenza) And Stay Heady During Flu Season Flu is a viral contamination that assaults your respiratory framework - your nose, throat and lungs. Flu is regularly called seasonal influenza; however it's not equivalent to stomach "influenza" infections that cause loose bowels and retching. For the vast majority, flu settles all alone. However, in some cases, flu and its difficulties...