You can protect yourself all year long against the flu by:
Everyone 6 months of age and older should get vaccinated against the flu.
Wash your hands often with soap and water or an alcohol-based hand rub. Avoid touching your eyes, nose, or mouth. Germs spread this way. Practice good health habits. Get plenty of sleep and exercise, manage your stress, drink plenty of fluids, and eat healthy food.
If you are healthy but exposed to a person with the flu, antiviral drugs can prevent you from getting sick. Antiviral medications are prescription pills, liquids, or inhalers used to prevent or treat flu viruses. They are approved for adults and children one year and older. There are four antiviral drugs approved for treating the flu in the United States—oseltamivir (Tamiflu), zanamivir (Relenza), amantadine (Symmetrel), and rimantadine (Flumadine). The sooner you are treated with an antiviral, the more likely it will prevent the flu. Antiviral drugs are 70% to 90% effective at preventing the flu.
Source:
http://www.flu.gov/prevention-vaccination/prevention/