People wait after receiving a Covid-19 vaccine at Cardiff and Vale Therapy Centre on December 8, 2020, in Cardiff, Wales. | Matthew Horwood/Getty Images

The UK begins to roll out its mass vaccination program.

A 90-year-old woman in the United Kingdom is now the first person in the world to receive a government-approved Covid-19 vaccine backed by robust clinical trials, marking the start of the country’s national mass vaccination campaign.

Margaret Keenan, a grandmother who turns 91 next week, received the first of the UK’s 800,000 doses of Pfizer and BioNTech’s mRNA-based Covid-19 vaccine early Tuesday morning at the University Hospital in Coventry.

“I feel so privileged to be the first person vaccinated against Covid-19,” Keenan said, according to the UK’s National Health Service. “It’s the best early birthday present I could wish for because it means I can finally look