The Queen is the latest member of the Royal Family to test positive for Covid-19.
The breaking news comes after her son Prince Charles tested positive for the virus.
The monarch who is understood to be triple-vaccinated is currently experiencing mild cold-like symptoms and is expected to continue light duties at Windsor this week.
The number of Royal Family members who have had Covid rises to six.
Before The Queen, Prince Charles and Camilla, Duchess of Cornwall, were the most recent members of the Royal Family to test positive for Covid-19. News of this was broken with an announcement on Valentine's day that Camilla was self-isolating.
The Duchess of Cornwall, 74, tested positive for Covid for the first time just days after the Prince of Wales contracted the illness for a second time.
A Clarence House spokesman said: “Her Royal Highness The Duchess of Cornwall has tested positive for Covid-19 and is self-isolating.
“We continue to follow government guidelines.”
Camilla is triple vaccinated, sources said.
Other members of the Royal household have contracted the virus during the pandemic.
Prince William
The Duke of Cambridge tested positive for Covid in April 2020, just days after his father Prince Charles tested positive for the first time.
The news was not made public at the time.
Sources claimed Prince William had been 'hit pretty hard' by the virus and at times had struggled to breathe, reports the Independent.
Prince Charles
The Prince of Wales tested positive for coronavirus in March 2020 and isolated for a week in Scotland.
Prince Charles later said he had 'got away with it quite lightly' as his symptoms were not severe.
Camilla, Duchess of Cornwall
Camilla, 74, caught the virus for the first time just days after the Prince of Wales contracted the illness for a second time.
A Clarence House spokesman said: “Her Royal Highness The Duchess of Cornwall has tested positive for Covid-19 and is self-isolating.
“We continue to follow government guidelines.”
Sophie, Countess of Wessex
Sophie, wife of Prince Edward, did not test positive for Covid but self-isolated in October 2020 after coming into contact with someone who had.
Sir Timothy Laurence
The husband of Princess Anne, the Princess Royal, tested positive for Covid in December 2021.
He was 66-years-old at the time.
The Princess Royal and Sir Timothy isolated at their country estate, Gatcombe Park in Gloucestershire.
Charles Spencer
The brother of Diana, Princess of Wales revealed in September 2020 that he had had Covid.
