It is officially flu season and doctors said one strain of the flu is expected to be especially severe this year. That strain is called the H3N2 strain. This year, flu season is expected to last from October until May. Doctors recommend getting the flu shot as early as possible. Anyone who is older than six months old can get a flu shot. It is scientifically proven to help protect you. The vaccine has an inactive virus that helps your body build up immunity to the flu.