As emerging mutations threaten the progress made against the pandemic, scientists and regulators are racing to figure out a process for updating shots. Dr Fauci acknowledged that the virus is changing more quickly than once thought, and that the variants now spreading around the world won’t be the end of its evolution. “That means that we as a government, companies, all of us in this together, will have to be nimble to be able to adjust readily, to make versions of the vaccine that are specifically directed toward whatever mutation is prevalent at any given time,”