Roll up those sleeves, it’s flu shot season. After last year’s influenza epidemic, more people are expected to get vaccinated this time around. The CDC [Centers for Disease Control] recommends to get the flu shot October 1st, or as soon as it’s available. And it’s available. Flu season typically runs from October until as late as May. It takes two weeks to gain immunity from the vaccine. After last winter, it’s not just hospital workers who are being proactive about prevention.