The term "Flu" is used to describe a range of influenza viruses that cause contagious respiratory infections. The symptoms also include headache, muscle soreness and fever. There are actually 3 different types of flu viruses, A, B and C.
Types A and B are the most common and are the cause of the influenza epidemics that flare up at certain times. Flu vaccines are formulated to protect against both type A and B viruses and are your best defense against infection. So what are the major differences between types A, B, and C?