The Prince of Wales, first in line to the throne, has tested positive for COVID-19.
He is 71 years old.
The heir has been displaying “mild symptoms but otherwise remains in good health”, according to a statement from Clarence House.
He has been working from home “throughout the last few days as usual”.
Camilla, the Duchess of Cornwall, has also been tested but does not have the virus.
The duke and duchess are now self-isolating at home in Scotland.
The statement added: “It is no possible to ascertain from whom the Prince caught the virus owing to the high number of engagements he carried out in his public role during the recent weeks.”
A statement from Buckingham Palace has confirmed the Queen is doing fine health-wise.
She last saw her son Prince Charles on the morning of March 12.
The statement added she is following all the appropriate advice with regard to her welfare.