A Clarence House statement reads: "In accordance with government and medical advice, the prince and the duchess are now self-isolating at home in Scotland. The tests were carried out by the NHS in Aberdeenshire, where they met the criteria required for testing.
"It is not 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 recent weeks."
His mother, Queen Elizabeth, 93, is in good health and is "following all the appropriate advice with regard to her welfare," according to a Buckingham Palace spokesperson.
On March 9, Prince Charles; Queen Elizabeth; Camilla, Duchess of Cornwall; Prince William and Kate Middleton, the Duke and Duchess of Cambridge; and Prince Harry and Meghan Markle, the Duke and Duchess of Sussex attended a Commonwealth Day service at Westminster Abbey. There were over 2,000 people in attendance, and it was recently announced that another person present at the service, one of the 54 flag bearers, had also since tested positive.