The prime minster tweeted: “Over the last 24 hours I have developed mild symptoms and tested positive for coronavirus.
“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. #StayHomeSaveLives.”
A Downing Street spokesperson said: “After experiencing mild symptoms yesterday, the Prime Minister was tested for coronavirus on the personal advice of England’s Chief Medical Officer, Professor Chris Whitty.
“The test was carried out in No 10 by NHS staff and the result of the test was positive.
“In keeping with the guidance, the Prime Minister is self-isolating in Downing Street.”
He will have to self-isolate from his girlfriend and fiance, Carrie Symonds, who is currently pregnant – and in the more at risk category.
It is also understood that he will remain at 10 Downing Street and will still be in charge of the government’s handling of the crisis, although last week the Government confirmed that Foreign Secretary Dominic Raab would take over from the PM if at any point he was incapacitated.
Johnson has been leading the government’s response to the pandemic, which has involved hosting daily press conferences alongside key cabinet ministers and health officials.
It is not known if the Government is testing those who have come into contact with Mr Johnson in the last week to text their exposure to the virus.
However, Sky News report that there is growing speculation that Rishi Sunak will also have to self-isolate given his recent close proximity to the PM.
Mr Johnson was last seen outside No.10 last night – alongside Sunak – applauding NHS workers who are combating the virus in a national show of appreciation.
This comes after it was announced that the UK death toll rose by 113 to 578 yesterday – the steepest increase so far.
There are now more than 11,600 confirmed cases of coronavirus in the UK, including Prince Charles.
Mr Johnson is known to have been in contact with the Prince of Wales in recent weeks, as the pair met at a Commonwealth Day service in Westminster Abbey on 9th March.
Charles is said to also be displaying mild symptoms of the virus “but otherwise remains in good health”.
This is a developing news story – more to follow.
Images via Twitter/Getty