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Margaret Keenan (L), who turns 91 next week, at University Hospital in Coventry, England, said Tuesday, "I feel so privileged to be the first person vaccinated against COVID-19, it's the best early birthday present I could wish for." Photo: Jacob King/POOL/AFP via Getty Images

U.K. medical teams began administering Pfizer-BioNTech coronavirus vaccine doses on Tuesday, with people aged 80 and older the first to be inoculated.

The big picture: The U.K. last week became the first Western nation to give emergency approval for a COVID-19 vaccine. Margaret Keenan, 90, was the world's first person to get a fully tested, clinically authorized COVID-19 vaccine, at a hospital in Coventry, England. Health Secretary Matt Hancock said, "We will look back on today, V-day, as a key moment in our fightback against this terrible disease."

A tweet previously embedded here has been deleted or was tweeted from an account that has been suspended or deleted.

Go deeper: In photos: How the COVID-19 pandemic unfolded in 2020

Editor's note: This article has been updated with details of Keenan's vaccination.

Go deeper

Jan 29, 2021 - World

EU grants conditional approval of AstraZeneca vaccine

Photo: Sunil Ghosh/Hindustan Times via Getty Images

The European Commission on Friday granted conditional approval of the Oxford-AstraZeneca coronavirus vaccine for people 18 years and older.

Why it matters: This is the third vaccine to receive approval from the commission, coming hours after the Emergency Medicines Agency recommended its authorization.

Jan 29, 2021 - Health

WHO says most pregnant women can now receive coronavirus vaccine

A doctor administering Moderna's coronavirus vaccine at a university hospital in Essen, Germany, on Jan. 18. Photo: Lukas Schulze/Getty Images

The World Health Organization has altered its guidance for pregnant women who wish to receive the coronavirus vaccine, saying now that those at high risk of exposure to the COVID-19 or who have comorbidities that increase their risk of severe disease, may be vaccinated.

Why it matters: The WHO drew backlash for its previous guidance that did not recommend pregnant women be inoculated with vaccines made by Pfizer-BioNTech or Moderna, even though data indicated that pregnancy increased the risk of developing severe illness from the virus.