Camilla is self-isolating after testing positive for Covid-19, Clarence House has confirmed, according to the BBC.
Her husband, the Prince of Wales, tested positive for the virus on Thursday, but Camilla, 74, carried out three public engagements on that day after testing negative.
Prince Charles met with the Queen two days before he tested positive.
Last week Buckingham Palace said the Queen had no Covid symptoms and on Monday said it had nothing to add.
It is the first time the duchess has caught coronavirus, while Prince Charles has the virus for a second time.
A Clarence House spokesman said they would follow government guidelines.
On Thursday, the duchess described herself as “luckily” negative, during a visit to Thames Valley Partnership in Buckinghamshire, saying of her testing regime: “I’ve taken it so many times”.
As well as the visit to Buckinghamshire, Camilla visited the Haven Paddington sexual assault referral centre in west London and opened the Nourish Hub community kitchen in Shepherd’s Bush – where she added the finishing touches to a Loobia Polo, an Iranian rice dish, that was being offered to refugees.
PA MEDIA The Duchess of Cornwall met volunteers during her visit to the UKHarvest charity’s West London “Nourish Hub” on Thursday
PA MEDIA Camilla visited The Haven Paddington on Thursday morning, this time with everyone wearing face masks
On Monday morning, Clarence House alerted the organisations Camilla visited and the media who covered her engagements.
The encounter between Prince Charles, 73, and his mother came when the prince visited Windsor Castle for an investiture – to meet people who had been honoured in the twice-annual honours list and officially give them their awards.
Buckingham Palace has not confirmed whether the Queen has been tested, citing medical privacy, and has only said that she was showing no symptoms.
