The first people to get the Pfizer vaccine in the UK are due to have their second dose this week.
Grandmother Margaret Keenan became the first person in the world to receive the jab earlier this month following its clinical approval.
The 90-year-old received an injection on December 8, and NHS England said at the time that she would have a “booster jab” 21 days later “to ensure she has the best chance of being protected against the virus”.
The most recent figures published by the Department of Health showed that the number of people to have had their first jab between 8 December and 20 December in the UK was 616,933.
But speaking on Christmas Eve, Prime Minister Boris Johnson said almost 800,000 people had been given their first dose of the two-stage vaccine.
Since the initial jabs were given in hospitals, the rollout has widened to GP-led sites and care homes.
A Welsh Government spokesman said people in Wales would begin receiving their second dose of the vaccine from January 5.
