"The Queen last saw The Prince of Wales briefly after the investiture on the morning of 12th March and is following all the appropriate advice with regard to her welfare," the Palace said in a statement on March 25.
"[He] remains in good health and has been working from home throughout the last few days as usual," the statement reads.
"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 Palace finished.
Charles is not the first royal to be diagnosed with the coronavirus, but his positive COVID-19 test is a first among the British Royal Family.
Last week, Karl von Habsburg, the ancestral Archduke of Austria, said he'd contracted the virus, and Prince Albert of Monaco also said he had the illness. Both also have mild symptoms and are recovering at home and following doctors' orders. Albert continues to work from the Prince's Palace.