“We will begin our quarantine and recovery process immediately. We will get through this TOGETHER!” the president said in a tweet early on Friday morning, Reuters reported.

Trump, 74, is at high risk with the deadly virus both because of his age and because he is considered overweight. He has remained in good health during his time in office but is not known to exercise regularly or to follow a healthy diet.

The president is “not incapacitated” and will work from the residence, a senior White House official said.

Vice President Mike Pence and his wife tested negative, a Pence spokesman said. The president and vice president will work from their separate residences and their staffs also will be kept apart, the White House official said.

Trump understated the seriousness of the coronavirus outbreak in its early stages and has repeatedly predicted it would go away. On Thursday night, he said the end of the pandemic was in sight. He rarely wears a mask and criticizes people, including Democratic presidential nominee Joe Biden, who do.

More than 200,000 people have died from COVID-19, the disease caused by the virus, in the US alone. The elderly and those with preexisting conditions have been especially hard hit.

Trump, a Republican, urged US states to reopen shuttered economies even as the number of cases continued to soar and knocked Democratic governors for putting tough measures into place to bring the virus under control.

His health scare, which rattled financial markets, shifts the 2020 presidential campaign dramatically.

With only weeks before the November 3 election, Trump will now be sidelined from in-person events after holding a slew of rallies with thousands of people at indoor and outdoor venues, against the advice of public health professionals.

Biden leads Trump in national polls.

Trump’s positive test also means that others at the highest levels of the US government have been exposed and may have to quarantine, too. A White House official said early on Friday that contact tracing was underway.

Trump’s physician, Sean Conley, said he expected the president to carry out his duties “without disruption” while he recovers.

“The President and First Lady are both well at this time, and they plan to remain at home within the White House during their convalescence,” Conley wrote in a memo that was distributed to the press.

Biden has criticized Trump sharply for his response to the pandemic; the president has praised himself and his team.

On Thursday night, shortly after Trump predicted the pandemic’s end was in sight, news broke that Hope Hicks, a top adviser and trusted aide, had tested positive for the virus. Hicks traveled with the president on Air Force One on Tuesday and Wednesday.

Change in the race

The White House issued a new schedule for Trump’s activities on Friday that did not include a planned trip to Florida.

The president’s condition is likely to bring the pandemic back to center stage in the race, after the death of Supreme Court Justice Ruth Bader Ginsburg shifted the campaign’s focus.

Trump, who has been criticized for questioning the efficacy of wearing a face covering, produced a mask from his pocket in his first debate against Biden on Tuesday and said, “I wear masks when needed. When needed, I wear masks.”

He then ridiculed the former vice president for putting one on regularly: “I don’t wear masks like him. Every time you see him, he’s got a mask. He could be speaking 200 feet away from them and he shows up with the biggest mask I’ve ever seen,” Trump said.

Health professionals say face coverings are key to preventing the virus from spreading.

The White House has had previous coronavirus scares. Pence’s spokeswoman, Katie Miller, tested positive earlier this year and suffered symptoms before recovering. A military valet also came down with the virus.

But the White House lowered its precautions as Trump sought to project a return-to-normalcy message this summer. Temperature checks of everyone entering the White House complex stopped, and while coronavirus tests continued for people who came into close proximity to Trump, others on campus were not tested.

Trump held a large campaign rally with thousands of people in Tulsa, Oklahoma, in June. Cases spiked in the area afterward, and Herman Cain, a prominent businessman and Trump supporter who attended the event, later fell ill with COVID-19 and died.

Trump restarted large rallies later in the summer, seeking to drum up enthusiasm for his candidacy against Biden, who has eschewed campaign events with large numbers of people.

Wall Street was set for a heavy tumble. Europe’s main bourses were down 0.5 percent, and futures markets were pointing to 1.5 percent to two percent losses for the S&P 500 and Nasdaq.

“I suspect markets will lean towards the view that Biden will likely win the election,” said Naoya Oshikubo, a senior economist at Sumitomo Mitsui Trust Asset Management. “What I am worried is that he will become even more aggressive against China after he caught the virus himself.”

Trump joins a roster of world leaders who have contracted the virus.

British Prime Minister Boris Johnson kept working in isolation for a little over a week after testing positive in late March, then fell gravely ill and was rushed into intensive care. He spent several weeks recovering before returning to work.

Canadian Prime Minister Justin Trudeau went into quarantine in March after his wife was diagnosed with the coronavirus. Brazil’s President Jair Bolsonaro called it a “little flu” after being infected in July.

Putin wishes speedy recovery

Russian President Vladimir Putin wished Trump a speedy recovery in a telegram on Friday, aljazeera.com reported.

“I am convinced that your vitality, good spirits and optimism will help you cope with this dangerous virus,” the Kremlin quoted Putin as saying in the message.

Putin’s spokesman Dmitry Peskov had earlier wished Trump “a speedy and easy recovery” on behalf of the Kremlin.

Peskov said Putin was considering whether to be vaccinated against the coronavirus, after Russia announced in August that it had developed a vaccine named ‘Sputnik V’ after the historic Soviet-era satellite. “When he does it, we will announce it,” Peskov said.

Tedros Adhanom Ghebreyesus, the head of the World Health Organization, also wished the couple “a full and speedy recovery”.

Trump is pulling the US out of the UN health agency, which he accuses of botching its response to the pandemic and being “a puppet of China”.

Throughout the pandemic, Tedros has consistently hit out at divisions in the international community, warning of the consequences of a lack of solidarity.