US President Donald Trump has said he and First Lady Melania Trump have tested positive for coronavirus and are now self-isolating.
Mr Trump, aged 74 and therefore in a high-risk group, wrote on Twitter: “We will get through this together.”
It comes after Hope Hicks, one of his closest aides, tested positive.
Mr Trump’s announcement comes just over a month before the presidential elections on 3 November where he faces Democratic challenger Joe Biden.
Ms Hicks, 31, travelled with Mr Trump on Air Force One to the first presidential TV debate with Mr Biden in Ohio on Tuesday. Some of Mr Trump’s family members who attended the debate were seen not wearing masks.
A person is required to self-isolate after either showing coronavirus symptoms or a positive test. Meanwhile, quarantine restricts the movements of those who have been in contact with an infected person, but are not themselves positive or symptomatic.
Mr Trump has mostly spurned mask-wearing and has often been pictured not socially distanced with aides or others during official engagements.
The coronavirus has infected more than 7.2 million Americans, killing more than 200,000 of them.
What do we know about Mr Trump’s health?
Mr Trump’s physician, Dr Sean Conley, released a statement late on Thursday, saying the president and the first lady were “both well at this time, and they plan to remain at home within the White House during their convalescence”.
“Rest assured I expect the president to continue carrying out his duties without disruption while recovering, and I will keep you updated on any future developments,” the statement said.
The physician provided no further details.
According to Mr Trump’s most recent physical examination earlier this year, he weighed 244lbs (110.7kg). This is considered to be obese for his height of 1.9m (6ft 3ins).
But Dr Conley stated at the time that the president “remains healthy”. Mr Trump will also have the best medical care available.
America’s Centers for Disease Control and Prevention says a person must self-isolate for 10 days after a positive test.
Earlier on Thursday, Mr Trump said he and his wife, who is 50, were going into quarantine after Ms Hicks’s positive test.
He tweeted: “Hope Hicks, who has been working so hard without even taking a small break, has just tested positive for Covid 19. Terrible!
“The First Lady and I are waiting for our test results. In the meantime, we will begin our quarantine process!”
It is not clear how Mr Trump’s positive test will affect arrangements for the second presidential debate, which is scheduled for 15 October in Miami, Florida.
Mr Trump is not the first world leader to have tested positive. Earlier this year, British Prime Minister Boris Johnson and Brazil’s President Jair Bolsonaro were infected. They both have since recovered, although Mr Johnson had to receive regular oxygen treatment to help his breathing during hospitalisation.
Have there been other cases at the White House?
In May, Vice-President Mike Pence’s press secretary Katie Miller tested positive and later recovered.
That same month, a member of the US Navy who was serving as one of Mr Trump’s personal valets tested positive.
But the White House said at the time that neither the president nor vice-president were affected.
National Security Adviser Robert O’Brien, a number of Secret Service agents, a Marine One pilot and a White House cafeteria worker have also tested positive.
The White House tests aides and anyone else who comes into contact with the president daily.
How the US and the world have reacted?
In a tweet, US Vice-President Mike Pence and his wife Karen wished the presidential couple well
Boris Johnson wrote on Twitter: “My best wishes to President Trump and the First Lady. Hope they both have a speedy recovery from coronavirus.”
Other world leaders, including Indian Prime Minister Narendra Modi and his Israeli counterpart Benjamin Netanyahu, also sent messages of support to the couple.