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Britain’s Prime Minister Boris Johnson has tested positive for coronavirus, he revealed Friday.

“Over the last 24 hours I have developed mild symptoms and tested positive for coronavirus,” the UK’s leader said on Twitter.

“I am now self-isolating, but I will continue to lead the government’s response via video-conference as we fight this virus.

“Together we will beat this,” he insisted, adding the “#StayHomeSaveLives” hashtag.

His infection means he will need to stay apart from new fiancee Carrie Symonds who is pregnant and at a higher risk, according to The Sun.

The prime minister has already been holding Cabinet meetings by the Zoom app, Downing Street had earlier confirmed — and was also shown having his weekly audience with 93-year-old Queen Elizabeth II by phone.

Johnson last saw the Queen — whose eldest son, 71-year-old heir to the throne Prince Charles, also has coronavirus — on March 11 and she remains in good health, Buckingham Palace said.

Two other key British politicians also confirmed cases of the potentially deadly bug Friday, suggesting it is spreading through the halls of power.

Health Secretary Matt Hancock confirmed shortly after Johnson’s announcement that he had tested positive, tweeting, “Thankfully my symptoms are mild and I’m working from home & self-isolating.”

A major political rival, the likely next leader of the Labour Party, Angela Rayner, also said she was self-isolating after developing symptoms.

“So me and Boris Johnson having the virus is pure coincidence — honest,” she tweeted with a blushing emoji

In a video, Johnson, 55, said that his “mild symptoms” were “a temperature and a persistent cough” and took the test “on the advice of the Chief Medical Officer.”

He said “working from home” and “self-isolating” was “entirely the right thing to do,” even for the man leading the UK.

“Be in no doubt that I can continue, thanks to the wizardry of modern technology, to communicate with all my top team to lead the national fightback against coronavirus,” he said.

He also thanked “everybody who’s working to keep our country through this epidemic.”

“And we will get through it,” he insisted. “We’re going to beat it, and we’re going to beat it together. Stay at home, protect the NHS and save lives,” he said.

Johnson’s spokesman, James Slack, said the prime minister was self-isolating in his apartment, which is above 11 Downing St., and would have his meals left outside his door by staff.

“For now the prime minister’s symptoms are mild and he is continuing to do all of the same functions he was performing before. The only difference is he will now have to do that by teleconferencing,” Slack said.

The government said that if Johnson is unable to work, Foreign Secretary Dominic Raab will replace him.

Johnson has met in person with some senior ministers and officials this week, and has appeared at press conferences alongside his top medical and scientific advisers.

There have been at least 11,658 confirmed cases of coronavirus across the UK, with at least 578 deaths, according to the Evening Standard.

With Post wires