What is the flu? If lots of people come down with similar symptoms, do they all have the same illness/disease? Remember that our body kicks off its inflammatory response (fever, headache, aching bones and joints, often with coughing and runny nose) when it has a systemic challenge and needs to send in soldier cells to do repairs, wherever they may be. Just because lots of people sneeze and sniffle and have "flu symptoms" in the wintertime does not mean they have a disease called "the flu."
Read his logic here.