Margaret Keenan, a 90-year-old grandmother from Northern Ireland, became the first person in the world on Tuesday to receive the Pfizer Covid-19 vaccine shot outside of a trial as Britain began vaccinating its population.

An early riser, Keenan received the Pfizer-BioNTech vaccine at her local hospital in Coventry, central England, on Tuesday morning at 0631 GMT (2.30pm Tuesday Malaysia time), a week before she turns 91...