The US public will start to receiving the Pfizer/BioNTech coronavirus vaccine from Monday after it was authorised for emergency use.
The first three million doses of the vaccine have just started to be shipped from the Pfizer facility in Michigan.
On Saturday 3,309 people died of Covid-related deaths in the US - the highest total in a single day anywhere in the world.
Washington correspondent Simon Marks speaks to Corin Dann.
