 [ Symptoms ] food if i am rushing to eat seems to get “stuck” without a sip of water is it a esophageal disorder [ Disease ] there is no benefit to receiving the flu shot a second time if you received the flu shot in september a vaccine received in the fall should protect you through the flu season the flu shot for the northern hemisphere is formulated once a year and there have not been any updates to the influenza vaccine for the 2012 2013 season since the last time you received it