US President-elect Joe Biden received his first dose of the Pfizer/BioNTech Covid-19 vaccine at a hospital in Newark, Delaware.
The 78-year-old incoming president urged Americans to get the vaccine when it is available. His wife Jill received the shot earlier, the presidential transition team said.
Mr Biden told Americans "there's nothing to worry about" when they get the vaccine and that in the meantime they should keep wearing masks and "listen to the experts".
He said the Trump Administration deserved credit for vaccine. Latest coronavirus stories The European Commission earlier gave approval for the use of the Pfizer/BioNTech Covid-19 vaccine, the final step to allowing Europe to start inoculations within a week.