Camilla, the Duchess of Cornwall is in isolation as well although she has previously tested negative for the disease. Her self-isolation is expected to last until the end of the week.
Prince Charles will resume meetings and take exercise now that his isolation is over.
The Queen, 93, is in good health according to Buckingham Palace and is staying in Windsor Castle with the Duke of Edinburgh, 98.
The Queen had her weekly conference with Boris Johnson by phone. Photo / Buckingham Palace
Prince Charles last saw his mother on March 12 - the day after doctor's believe he became infectious.
Coronavirus has hit the halls of power in Britain with Prime Minister Boris Johnson, his adviser Dominic Cummings, Health Minister Matt Hancock and Chief Medical Officer Chris Whitty isolating after displaying symptoms of the disease.