“Flu season” is generally considered to be from October or November to May. The flu spreads through coughs, sneezes, sharing drinks or food, and by touching infected surfaces.
The flu contributes to between 140,000 and 170,000 hospitalizations in the US every year. Estimated annual flu deaths hit a low of 12,000 in 2011-12 and a high of 56,000 during 2012-13.
According to the CDC, everyone six months and older should get a flu shot every year. The vaccine takes about two weeks to build up your immunity, so get your shot by October 31.