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The Queen and the Duke of Edinburgh have been given a Covid vaccine today, according to Buckingham Palace.
Elizabeth II, aged 94, and 99-year-old Prince Philip are in the high-risk category.
Buckingham Palace says the usually "private medical matter" is being shared to prevent further speculation.
A royal source told the BBC the vaccinations were administered on Saturday by a household doctor at Windsor Castle.
It is not known whether they received the Pfizer/BioNTech or the Oxford/AstraZeneca jab.
About 1.5 million people in the UK have received a Covid vaccination so far.