Lab developing flu shot that could last years Researchers are working on a universal flu vaccine that, if successful, could offer flu protection for up to 10 years. January 16 2013 at 02:31pm Related Stories Comment Guidelines Please read our comment guidelines. Login and register, if you haven’ t already. Write your comment in the block below and click (Post As) Has a comment offended you? Hover your mouse over the comment and wait until a small triangle appears on the right-hand side. Click triangle () and select "Flag as inappropriate". Our moderators will take action if need be.