Prince Charles, the heir to the British throne, has tested positive for coronavirus, his household said. In a statement, officials say he has been diagnosed with mild symptoms, but is otherwise in good health. His wife, Camilla, has also been tested, but does not yet have the virus. Both are in self-isolation at their home in Scotland. Charles, eldest son of Queen Elizabeth, is 71 years old, and is in the most at risk age group for the virus.