Trump diagnosis 'blessing in disguise'

US President Donald Trump credited an experimental drug treatment with helping him recover from Covid-19 and suggested his diagnosis could be a "blessing in disguise" for the United States.

But there is no way for the president or his doctors to know whether the drug works.

In a video, Trump, 74, also said his illness shed light on the experimental antibody cocktail.

Trump promised to get the drug approved swiftly for broader use - and to make it free - though he does not have the power to do so.

"I want everybody to be given the same treatment as your president because I feel great,'' Trump said. "I feel, like, perfect."

Still, questions continue to swirl about Trump's recovery and when he might return to campaigning, less than four weeks before election day.

He received an experimental antiviral cocktail made by Regeneron on a "compassionate use" exemption, but its safety and effectiveness are not proven.

It's not the first time Trump has trumpeted an unproven treatment - he spent months painting the anti-malarial drug hydroxychloroquine as a miracle treatment, though experts said it did not work against Covid-19.

Trump hailed the Regeneron cocktail as drugmaker Eli Lilly moved on with a similar treatment, asking the Food and Drug Administration to allow emergency use of its experimental antibody.

Also in the video, Trump continued to downplay the virus, promising those who are ill that they will "get better fast - just like I did.''

Trump posted the video on Twitter not long after aides said he had spent time in the Oval Office - despite him still being contagious two days after discharge from Walter Reed National Military Medical Center.