Prince William fell ill with the coronavirus in April shortly after his father, but kept his diagnosis secret, it was reported.
The Duke of Cambridge is believed to have survived when he was struck down by COVID in April, the BBC reported.
He sought medical treatment after being badly hit and having difficulty breathing, but the diagnosis itself was kept secret, according to allegations first published in The Sun.
The British newspaper reported that the Prince recently revealed his positive diagnosis at an official appointment, discreetly telling an observer that he had kept it secret because he did not want to alarm anyone.
Royal BBC correspondent Jonny Dymond added: “The Palace also tries to maintain a certain privacy for the royal family.
In April, the Prince continued to perform his royal duties by making 14 telephone and video appearances while isolated in his country residence, Anmer Hall, in Norfolk.
Among them, on April 16, he opened a coronavirus hospital “NHS Nightingale” by video at the NEC venue in Birmingham in the Midlands.
And for the “Comic Relief” charity event, which aired on April 23, he did a cheerful sketch with comedian Stephen Fry based on the popular show “Blackadder”.
His illness came shortly after Prince Charles became infected with the corona virus on the weekend of March 21 and 22, which had isolated itself in Birkhall, Scotland.
The Prince of Wales later said in a video for Age U.K.: “Having recently gone through the process of infection with this corona virus, fortunately with relatively mild symptoms, I am now on the other side of the disease, but still in a state of social distance and general isolation.
He added: “At such an unprecedented and fearful time in our lives, my wife and I are thinking especially of all those who have lost loved ones in such difficult and abnormal circumstances, and of those who have had to endure illness, isolation and loneliness.
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Prime Minister Boris Johnson fell seriously ill with the virus in April and was taken to hospital the same day that Queen Elizabeth II gave a dramatic address to the nation.
On April 5, she said: “Although we have faced challenges before, this one is different.
“This time we are joining forces with all the nations of the world in a common endeavor, using the great advances in science and our instinctive compassion to heal.
“We will succeed – and this success will belong to each of us.
“We should take comfort in the fact that while we have more to endure, better days will return: We will be with our friends again; we will be with our families again; we will see each other again”.