Her Majesty, 93, and the Duke of Edinburgh, 98, have been self-isolating at Windsor Castle for the past week.
On Wednesday, March 25, Clarence House announced Charles, 71, has the deadly virus but he "remains in good health".
Clarence House's full statement on Prince Charles
The statement read: "The Prince of Wales has tested positive for coronavirus.
"He has been displaying mild symptoms but otherwise remains in good health.
"He has been working from home throughout the last few days as usual.
"The Duchess of Cornwall has also been tested but does not have the virus.
"The tests were carried out by the NHS in Aberdeenshire where they met the criteria required for testing.
Following the news, fans have expressed their worries for the Monarch and Philip - who are also considered high-risk.
One person wrote on Twitter: "Is the Queen safe? She must be kept safe!"
Another said: "Prince Charles tested positive for #coronavirus. What about the Queen? I hope she is fine."
A third added: "Apparently Prince Charles has coronavirus... they better keep the Queen safe or I'll throw hands."
Buckingham Palace has released a statement insisting the Queen is in "good health".
The Palace's full statement
The statement read: "Her Majesty The Queen remains in good health.
"The Queen last saw The Prince of Wales briefly after the investiture on the morning of 12th March.
"[She] is following all the appropriate advice with regard to her welfare."
Earlier this month, the Queen and Philip had moved to Windsor Castle amid the pandemic.
A statement read: "Her Majesty will move to Windsor Castle for the Easter period on Thursday 19th March.
"It is likely the Queen will stay there beyond the Easter period."
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