Scientists said they had discovered immune cells that can fight all known flu viruses in what was hailed as an "extraordinary breakthrough" that could lead to a universal, one-shot vaccine against the killer disease.
Influenza epidemics, largely seasonal, kill hundreds of thousands of people each year, according to the World Health Organization.
Due to its mutating strains, vaccine formulas must be regularly updated and only offer limited protection currently.
Researchers in Australia said that "killer T cells" -- found in over half the world's population -- had shown in testing to be effective in fighting all common flu varieties.
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