Coronavirus conversation: Vaccine rollout, Bureaucracy, Biden versus Trump, China after SARS 2003,

Will the vaccine work against mutant strains of Coronavirus?
We are closer to the beginning of the end than the end of the beginning. Numbers are dropping.
How much vaccination is necessary to lower the R factor? Probably lower than you think.
Outside of Wuhan) How did China avoid having coronavirus cases? Did they in actuality? Is this factitious? Does a top-down approach work? Did they operate at "warp speed?" Did China create and distribute vaccine after the original SARS, 2003?
Trump administration scorecard on coronavirus response, operation warp speed, applying federalism to public health. The New York Times view of Mr. Trump's handling of the virus.
What would a Biden administration have done differently?