You don't have to get the flu vaccine to guard against the Flu 

It is somewhat easy to keep the flu at bay. Boosting your immune system before flu season strikes is of course a priority. Along with eating a healthy diet, getting enough sleep and exercise, and keeping a lid on stress, make sure you’re getting plenty of antioxidants , especially beta-carotene and vitamins C and E. Green tea extract is a particularly potent antioxidant and is a good addition this time of year.