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PBS News Hour
A universal flu vaccine could finally be within sight
Influenza is a shape-shifter virus that could spark a global pandemic. Researchers at the National Institutes of Health are working to deliver what is referred to as The Holy Grail in the fight: a universal flu vaccine that could protect against all strains of the virus. William Brangham concludes our pandemics series by learning what it will take to develop a universal vaccine.
