A new flu vaccine could give life-long protection against all types of flu in a single jab, according to experts.
The new jab, developed by scientists at Acambis, could protect against all strands of type A influenza.
Currently the flu jab has to be redesigned regularly because the flu virus keeps changing.
Initial trials of the new drug, ACAM-FLU-A, in the US have shown it to be safe and work effectively.
Nine out of ten who had two doses developed antibodies against the virus.
Dr Michael Watson of Acambis said: "As a universal vaccine, ACAM-FLU-A can potentially overcome many of the drawbacks of existing influenza vaccines.
"It can be manufactured at any time of the year, and could be stockpiled in advance of a pandemic or potentially used routinely to ensure population protection against future pandemics."
Scientists at the drug company are currently working on a method to perfect the formulation.
Each year approximately 1,200 people are killed by winter flu, many of them elderly.
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