“If the world doesn’t share the vaccine,the virus will take on the world”

What did George Gao mean by the title quote?The statement certainly feels like a warning,but it is a warning that comes with a prescription that carries optimism and hope.The warning that the virus will“take on the world”has indeed been the world’s experience during the first year of COVID-19.But the warning is more ominous with the continual emergence of variants of the coronavirus that have differing characteristics-transmission speed,pathogenicity,evasion of immunity to prior infection or immunization(1).