Therefore, scientists at Oxford University are carrying out human trials of a new vaccination that targets a different part of the virus to existing methods.
If successful it would represent a breakthrough in tackling a flu pandemic by allowing stockpiles to be prepared much further in advance, reports Telegraph.
Flu researchers currently face a constant battle to keep up with the regular mutations in the virus.
The new jab will be given to a small number of volunteers to test the dosage before larger trials take place. It will be several years before it comes on the market.