Trump again tests negative for coronavirus

US President Donald Trump has tested negative for the novel coronavirus for a second time and is "healthy" and not displaying any symptoms for the deadly disease, the White House physician has said.

Sean Conley, Trump's physician, did not provide any context for the second test. The doctor, however, said the president had been tested by a new rapid-point-of-care test that delivered results in 15 minutes.

"The President tested negative for COVID-19," Conley, said on Thursday in a memorandum to the White House Press Secretary Stephanie Grisham.

"This morning, the President was tested again for COVID-19, utilising a new, rapid-point-of-care test capability. He is healthy and without symptoms. Sample collection took just one minute and results were reported back in 15 minutes," Conley said.

President Trump flashed a copy of his physician's memorandum to his press secretary during his daily White House news conference.

"I did take a test. It just came out, this is from the White House physician," Trump said at the briefing while holding up the memo.

"You may have it, just came out. I just took it this morning. And I took it, it took me literally a minute to take it and it took me - I guess it was 14 or 15 minutes (for results). I went to work, I didn't wait for it, but it said it took 14 minutes or something with a conclusion and it said the President tested negative for COVID-19," he was quoted as saying by the US media.

Trump added that he had taken the test "really out of curiosity to see how quickly it worked, how fast it worked."