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Researchers say they are closer to developing a vaccine to give life-long protection against any type of flu, after promising trials in animals.
Two separate US teams have found success with an approach that homes in on a stable part of the flu virus.
That should remove the problem with current flu vaccines which must be given anew each year because they focus on the mutating part of the virus.
The proof-of-concept work is published in Science journal and Nature Medicine.
Studies are now needed in humans to confirm that the method will work in man.
In the meantime, experts say people should continue to receive an annual flu jab because vaccination is still the best way to protect yourself against infection.For more click here