The 2013 -14 Influenza Season has begun and health officials are seeing an increase in flu activity. San Joaquin County Health Officer Dr. Karen Furst urges, “All those who have not done so already, should get their annual influenza or “flu” vaccine now; don’t wait to vaccinate and protect yourself and your family against influenza this year.” Keep in mind, it takes up to two weeks after vaccination for full immunity to take effect and winter holiday activities and gatherings are prime opportunities for flu viruses to spread.