US scientists expect to know in the next few days if coronavirus vaccines might not work against a mutated variant of the virus that's rapidly spreading in parts of England.
While there's always a worry that a vaccine won't work if a virus mutates significantly, the Walter Reed scientists still expect the vaccine will be effective against this new variant, said Dr Nelson Michael, director of the Centre for Infectious Diseases Research at the Walter Reed Army Institute of Research.
"It stands to reason that this mutation isn't a threat, but you never know. We still have to be diligent and continue to look," Dr Michael said.