The 95-year-old sovereign — who is celebrating her 70th year on the throne — is experiencing mild cold-like symptoms but expects to continue light duties at Windsor over the coming week, the palace said.
“She will continue to receive medical attention and will follow all appropriate guidelines,” it added.
The Queen is not the only person in her circle to test positive for Covid-19, a royal source said on Sunday.
“A number of cases have been diagnosed in the Windsor Castle team,” the source told CNN, without specifying who else had tested positive.
The Queen’s health has been closely scrutinized since late last year when she retreated from public events on advice from doctors to rest after an overnight hospital stay for an undisclosed reason. Fresh concern was renewed in the past few days as multiple family members self-isolated after testing positive for the virus.
A royal source confirmed at the time that the Queen had “recently” met her eldest son, but the source did not elaborate on exactly when the interaction had taken place.
The Prince of Wales previously contracted coronavirus in March 2020, as countries around the world were first feeling the effects of the pandemic. Charles said at the time that he was first infected that he had been lucky only to experience mild symptoms, adding that he’d “got away with it quite lightly.”
On Wednesday, the monarch held an audience with the outgoing Defence Services Secretary, Rear Admiral James Macleod, and his successor, Major General Eldon Millar, during which she appeared in good spirits.
On her return to Windsor, a royal source had told CNN the Queen was resuming her regular duties of audiences, credentials and privy council meetings.
She has made plans to appear at a number of major engagements next month: a diplomatic reception at Windsor Castle on March 2, the annual Commonwealth Service at Westminster Abbey on March 14; and a service of thanksgiving for Prince Philip at the same venue on March 29.
While all are still a few weeks away, the Queen’s positive Covid-19 test may put her attendance in doubt.
On Sunday, British Prime Minister Boris Johnson wished the Queen a “swift recovery” in a post on Twitter.
“I’m sure I speak for everyone in wishing Her Majesty The Queen a swift recovery from Covid and a rapid return to vibrant good health,” wrote Johnson, who contracted Covid-19 himself in March 2020, at the height of the first wave in the UK, spending three nights in ICU.