The UK's Prince William had contracted the novel coronavirus in April, just days after his father Prince Charles and Prime Minister Boris Johnson were also diagnosed with the disease, but chose to keep it a secret in an effort to avoid alarming the country, a media report said.

According to the Sun newspaper report published on Sunday, the 38-year-old Duke of Cambridge had told an observer at an engagement that "there were important things going on and I didn't want to worry anyone".