Cold & Flu Influenza (or as it is commonly known, the flu or the grippe) is a contagious disease, caused by an RNA virus of the orthomyxoviridae family. Cold & Flu It rapidly spreads around the world in seasonal epidemics. Cold & Flu The name comes from the old medical belief that unfavourable astrological influences cause the disease. We welcome you to browse through our Cold & Flu product line. You will also find Cold & Flu updated shopping; it’s safe, secure and easy to use.