LAST YEAR’S SEASONAL flu vaccine was a bit of a dud: It reduced a person’s risk of needing to see a doctor for the flu by only 23 percent. That wasn’t anyone’s fault really. Vaccines take months to make, and flu viruses are constantly mutating, so making the shots takes some guesswork.
Ref: Hemagglutinin-stem nanoparticles generate heterosubtypic influenza protection. Nature Medicine (2015) | DOI:10.1038/nm.3927
Good thing it's not flu season...