Prince Charles, heir to the British throne, has tested positive for coronavirus but is displaying only "mild symptoms," his office announced Wednesday.

"He has been displaying mild symptoms but otherwise remains in good health and has been working from home throughout the last few days as usual," a statement said.

It said that his wife Camilla, the duchess of Cornwall, "has also been tested but does not have the virus."

"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 (National Health Service) in Aberdeenshire where they met the criteria required for testing."

(Britain's Prince Charles leaves the Imperial Palace in Tokyo after attending Japanese Emperor Naruhito's enthronement ceremony on Oct. 22, 2019)

"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," the statement said.

According to the Press Association, a source said the most conservative estimate was that the prince, aged 71, became contagious on March 13. His last public engagement was March 12.

Meanwhile, a Buckingham Palace spokeswoman said that Queen Elizabeth remains in good health. The 93-year-old monarch last saw the Prince of Wales on March 12 "and is following all the appropriate advice with regard to her welfare."

The queen is currently staying in self-isolation at Windsor Castle with her husband Prince Philip.