We are in the midst of the worst flu season since 2009. Hopefully the majority of college students going back to school this week have already had the flu vaccine in the fall and I would strongly recommend that those teens that have not been vaccinated get the flu shot before returning to school either in their doctors offices or at the local pharmacy (ie. CVS or Walgreens). Many college health services also offer flu vaccination. This years vaccine is about 62% effective.