Camilla, Duchess of Cornwall also tested positive for Covid-19 today, just four days after her husband Prince Charles, and the couple are now in self-isolation.
Royal family sources said Camilla, 74, had been triple-vaccinated, adding that Clarence House would continue to follow government guidance and review her commitments.
Camilla contracted the virus for the first time, and Charles contracted it for the second time. She completed assignments last Thursday, the day Charles tested positive.
A spokesman for Clarence House said: “The Duchess of Cornwall has tested positive for Covid-19 and is self-isolating. We continue to follow government guidance.”
This comes as doctors continue to monitor the Queen’s health after Charles was diagnosed with Covid-19 less than 48 hours after meeting his mother last week.
Camille described herself as “fortunately” negative on the same day, saying of her testing regime during a visit to Buckinghamshire last Thursday: “I’ve been through it so many times.”
It is unclear if Camilla also saw the Queen. Earlier this month, the monarch, who is turning platinum, backed Camilla to one day be known as queen consort and urged the public to support her and Charles when he becomes king.
Concerns about the Queen’s health intensified last week after the 95-year-old monarch was in direct contact with eldest son Charles two days before he tested positive.
The Duchess of Cornwall at the Thames Valley Partnership in Buckinghamshire last Thursday.
Buckingham Palace said last Thursday that the Queen has no symptoms but declined to confirm whether she tested positive or negative.
MailOnline contacted Buckingham Palace this afternoon for an update.
The 95-year-old spent time with Charles last Tuesday when the Prince of Wales held an investiture on her behalf at her home at Windsor Castle.
It was the first time he had seen her since Christmas. But Charles, who also received the triple vaccination, unexpectedly tested positive on a routine lateral flow test.
Buckingham Palace declined to say if the Queen herself had been tested, and if so, what the result was, saying she has a “right to medical confidentiality.”
Earlier last week, Buckingham Palace also announced a soft and “gradual” return of the Queen to official events following her recent ill health.
Charles and Camilla at the British Asian Trust reception at the British Museum last Wednesday.
As far as is known, Charles, 73, did not show any symptoms of Covid-19. He self-isolated, though officials declined to say where exactly.
His wife, the Duchess of Cornwall, tested negative last Thursday shortly before undertaking a series of public events.
These included visiting the Thames Valley Partnership charity in Buckinghamshire and the UKHarvest west London charity Nourish Hub on the same day.
On Wednesday night, the couple interacted with 350 guests at a British Asian Trust reception at the British Museum – the day before Charles tested positive.
Among those Charles met and greeted were Chancellor Rishi Sunak and Home Secretary Priti Patel.
Charles and Camilla spent a long weekend together at Highgrove, his Gloucestershire country residence.
The Duchess of Cornwall at UKHarvest West London’s Nourish Hub last Thursday.
They left separately last Tuesday morning, with the Prince driving straight to Windsor Castle to present honors to nearly 100 members of the public.
Camille traveled to Bath for two events. On Thursday, Charles was due to visit Winchester to mark the Queen’s Platinum Jubilee and unveil the monument.
The announcement of his positive test was made just after noon – about 12 minutes before he was due to arrive.
More than 1,000 people gathered behind the barriers and groaned as the Queen’s representative in Hampshire, Lord Lieutenant Nigel Atkinson, broke the news.
In an address to the crowd, Charles said, “I’m sorry I can’t be with you today. I am extremely disappointed as I have been looking forward to celebrating this historic event with you.
Mayor of London Sadiq Khan greets the Duchess of Cornwall at Paddington Haven, a sexual harassment center in West London, during a visit they both made last Thursday.
“I really hope that I can visit it in the future. But for today, please accept my most sincere apologies and best wishes.”
Royals always take a sidestream test before hosting a public event.
Under current Covid regulations, although Camilla lives with Charles, Camilla was not required to self-isolate when she tested negative last Thursday because she is also fully vaccinated. But now she has to self-isolate after a positive test.
Camilla and Charles can come out of isolation if their tests on days five and six come back negative and they don’t have a fever.
This is the second time that Charles has contracted the virus. He tested positive at the beginning of the pandemic in March 2020, when there was no vaccination.