The Queen has been pictured at Windsor Castle as she held her weekly audience with the Prime Minister by telephone.
Pictures posted on Twitter by the Royal Family and the Prime Minister shows the Queen on an old fashioned phone in her Berkshire royal residence and Boris Johnson in his Downing Street office holding a phone to his ear.
The weekly audience comes on the same day that Clarence House announced that the Prince of Wales has tested positive for coronavirus.
Buckingham Palace said the Queen, 93, who is staying at Windsor Castle with the Duke of Edinburgh, 98, remains in good health and is following all appropriate advice.
In the picture posted on Twitter, the monarch is in a room adorned with ornaments including a china corgi.
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The royal family's tweet said: "The Queen held her weekly Audience with the Prime Minister today by telephone.
"Her Majesty - pictured this evening at Windsor Castle - has held a weekly Audience with her Prime Minister throughout her reign."
Prince Charles developed symptoms over the weekend but "otherwise remains in good health".
The heir to the throne met hundreds of people during a "high number of engagements" in recent weeks - where he offered namaste gestures instead of handshakes - but it is "not possible to ascertain" where he caught the virus, his spokesman said.
The Queen is expected to make a public address to the nation at some point in the coming weeks and is likely to pay tribute to health workers treating the sick, sympathise with bereaved families and offer support to the nation living with the restrictions aimed at combating the virus.
Camilla, the Duchess of Cornwall, 72, has tested negative for coronavirus and is self-isolating with her husband at their 53,000-acre Birkhall estate in Scotland, although they are apart from each other at the residence.
Charles - who has since spoken to the Queen and sons William in Norfolk and Harry in Canada - is the first Royal Family member to be diagnosed with Covid-19. He falls within one of the highest risk categories given his age.
A Buckingham Palace spokeswoman said: "Her majesty the Queen remains in good health.
"The Queen last saw the Prince of Wales briefly after the investiture on the morning of March 12 and is following all the appropriate advice with regard to her welfare."
On Wednesday evening, the royal family tweeted: "Thank you to organisations such as the @RoyalVolService who have been supporting and furthering this recruitment drive.
"Volunteers always have a huge role to play in society, but never more so than in difficult times - and for that we salute you."
