Trump Calls His Illness ‘a Blessing From God’

President Trump claimed on Wednesday that catching the coronavirus was “a blessing from God” and portrayed as a miracle cure the unproven therapeutic drug he was given after testing positive last week for the virus.

Mr. Trump said he planned to make the antibody cocktail being developed by the drug maker Regeneron, which does not yet have government approval, free to anyone who needs it. He did not explain how he would do it, although on Wednesday night, Regeneron said it had submitted an application to the Food and Drug Administration for emergency approval.

The president’s statement, in a video released early Wednesday evening by the White House, was his latest effort to repair the political damage he has suffered after months of trying to minimize the effects of a pandemic that has killed more than 211,000 Americans.

In remarks he made while he was at Walter Reed National Military Medical Center, where he was taken by helicopter on Friday night, and then when he returned to the White House on Monday, Mr. Trump did his best to play down the virus’s effects, telling Americans, “Don’t be afraid of it,” and saying that he felt “better than 20 years ago.”

But in the video released Wednesday night, Mr. Trump, whose skin appeared darkened by makeup and who appeared to struggle to get air at times, seemed to be saying that he had discovered, without evidence, a new drug that suddenly made him feel better and could do the same for everyone else with Covid-19.

“I call that a cure,” said Mr. Trump, adding that everyone should have access to the not-yet-approved drug for “free” and that he would make sure it was in every hospital as soon as possible.

Just hours after the video was released, Regeneron said it was asking the Food and Drug Administration for emergency authorization to make the drug available. The company has received more than $500 million from the federal government to develop and manufacture its experimental treatment as part of “Operation Warp Speed,” the federal effort to come up with viable vaccines and treatments for the virus, in order to help distribute it once it is available.

But although Mr. Trump had said hundreds of thousands of patients would soon have access to the cocktail, Regeneron said in a statement that it would initially have only enough doses for 50,000 people. It hopes to have enough for 300,000 people by the end of the year, and the medication is expected to be provided to Americans for free.

“I think this was a blessing from God that I caught it,” Mr. Trump said, apparently referring to the fact that he had learned about the benefits of the drug as a result of becoming ill.

It was the first time that Mr. Trump tacitly acknowledged another appearance problem — that he has received the kind of intensive and costly medical care for coronavirus that is not available to any member of the general public.

In an interview on Wednesday before the company made its announcement, Dr. George Yancopoulos, Regeneron’s president and chief scientific officer, said it was possible that Mr. Trump responded to the treatment and that the level of virus had declined. “That’s a logical conclusion,” Dr. Yancopoulos said. “Based on his symptomology, that has to have happened.”

But neither Dr. Yancopoulos nor Mr. Trump can definitively say whether the treatment worked because any drug must be proved in large clinical trials that compare the outcomes of people who got the product with those who received a placebo. Those trials have not yet been completed.

Dr. Peter Chin-Hong, an infectious disease specialist at U.C.S.F. Health in San Francisco, said in his opinion, there was “one million percent no” chance that the Regeneron treatment could have cured Mr. Trump in 24 hours, as the president claimed.

Another explanation, he said, is that the president is experiencing the effects of the steroid dexamethasone, which he has been receiving since Saturday, which is known to reduce fever and can create feelings of well-being and euphoria in patients. “This is all in keeping with the dexamethasone speaking,” Dr. Chin-Hong said.

The president has been desperate to announce some kind of definitive treatment, or a vaccine, ahead of the election on Nov. 3, in which nearly all polls show him trailing former Vice President Joseph R. Biden Jr., the Democratic nominee, nationally and in key states.

Mr. Trump has also been looking for a type of miracle cure for the virus for months, initially seizing on hydroxychloroquine as an answer before health experts raised concerns about its use. But his disdain for those experts has been consistent with his general refusal to believe in science, a refusal that led The New England Journal of Medicine, in an editorial published on Wednesday, to say the Trump administration had responded so poorly to the coronavirus pandemic that it had “taken a crisis and turned it into a tragedy.”

The journal did not explicitly endorse former Vice President Joseph R. Biden Jr., the Democratic nominee, but that was the only possible inference, other scientists noted.

The New England Journal of Medicine’s editors join those of another influential journal, Scientific American, who last month endorsed Mr. Biden.

The Regeneron antibody cocktail is not the only drug that Mr. Trump was prescribed. He has also been taking the antiviral drug remdesivir, as well as the steroid dexamethasone, which the World Health Organization and National Institutes of Health recommend only for people who have severe or critical cases of Covid-19.

Doctors have declined to say what other medications Mr. Trump is taking as he fights off the virus.

Most people with Covid-19 eventually recover, and medical experts have also said that Mr. Trump is most likely still battling it. Dexamethasone, which the president first received on Saturday, is known to create a sense of well-being and euphoria in many people who take it, as well as bursts of energy.

Outside medical experts have said that the next week will be pivotal because many patients who do poorly take a turn for the worse in the second week after symptoms arise.

The Regeneron treatment is one of several similar antibody therapies — another is being developed by Eli Lilly — that seek to give people powerful antibodies in the hopes of boosting their immune response.

But although both companies have reported promising early results, clinical trials are still underway. Although Mr. Trump credited the Regeneron treatment with having improved his illness, there is no way to know if a drug is safe and if it works without testing it in large groups of people, some who receive the drug, and some who get a placebo.

Regeneron and Eli Lilly have said the therapies could be available before the end of the year. Some medical experts have seen the therapies as a sort of bridge until vaccines are available — the infusion of antibodies could be given to people who have been exposed to the virus in order to prevent infection, as well as to people who are still early in the course of the disease.

In his video, Mr. Trump suggested that the treatments could soon be authorized for emergency use. “We have to get them done, we have to get them approved,” he said. But that is a potentially risky move because it could allow the treatments to become widely used before they have been proven. Broader access to the drugs could then jeopardize enrollment in clinical trials, because people may be reluctant to participate if there is a chance they could receive a placebo.

The president also used the video as another opportunity to push for the emergency approval of a vaccine before the election, even though the Food and Drug Administration has issued guidelines to companies that would mean meeting such a deadline is not possible. “I think we should have it before the election, but frankly, the politics gets involved, and that’s OK,” he said.

A handful of vaccine makers are testing their candidates in large clinical trials and have said they could have an answer before the end of the year, but they have also made an unusual pledge to not bring their vaccines to market before they are thoroughly vetted.

Monoclonal antibodies like the ones that Regeneron is developing are difficult and expensive to manufacture, and some have raised questions about whether the companies will be able to make enough to meet global demand if they are proven to work. In August, the company announced it was teaming up with a larger company, Roche, to ramp up production.

The video was not the only way Mr. Trump tried on Wednesday to put the best spin on his illness.

In midafternoon, he resumed working in the Oval Office, defying the aides who had hoped he would remain in his private quarters in the White House or a work space specially set up him for him because he is sick.

The president had made clear that was his intention from the time he returned from the hospital on Monday. The presence of a Marine guard outside the office shortly after 3 p.m. signaled that he had gotten his wish, flouting the safeguards sought by his aides at a time when a wave of infections has left the White House thinned out of staff.

Melania Trump, the first lady, has remained in the White House residence since last week when it was announced that she had also tested positive.

A White House official said that Mr. Trump had entered the Oval Office by walking along the colonnade outside, meaning there was a smaller amount of viral load he would have been shedding indoors. Only two aides were said to be with him — Mark Meadows, the White House chief of staff, and Dan Scavino Jr., a deputy chief of staff — and wearing personal protective equipment like masks and gloves.

An “isolation cart” filled with such equipment was put next the indoor entrance to the Oval Office.

Earlier in the day, the White House physician, Dr. Sean P. Conley, whose reports on the president have been unfailingly upbeat, released a memo saying that Mr. Trump began the day saying, “I feel great!” and that he had been symptom-free for more than 24 hours and fever-free for more than four days.

Dr. Conley said the president’s oxygen and respiratory levels were normal and stable, and that blood drawn from him two days earlier showed the presence of antibodies for the coronavirus. Medical experts and Regeneron itself later said that the antibody test most likely revealed nothing more than that Mr. Trump had received a large dose of the experimental antibody cocktail.

Gina Kolata contributed reporting.