The President made the bizarre claim at a rally in Martinsburg, Pennsylvania yesterday
“Of course Barron had it,” he told the crowd referring to the virus he, his First Lady Melania Trump and their son Barron, 14, were first diagnosed with earlier this month.
“I said, "What's the story, doc, with Barron?"
Acting out both parts, the doctor replied: “Sir, he tested positive.”
“Like 15 minutes later,” Trump said, he asked the doctor: “How's Barron doing?”
“Sir, it's gone,” Trump said the doctor told him, as the crowd cheered and laughed.
The president seems to be using his son's recovery as a reason why American schools should reopen as soon as possible, a move opposed by teachers' unions who fear their members could be infected by students.
He continued: “We have to get back to school Pennsylvania, you have a governor who doesn’t want us to do anything in Pennsylvania – did you see the poll that came out were up two and were up four.”
Trump has recycled the same anecdote at several rallies this time increasing the time Barron had tested positive for coronavirus from two seconds.
In a rambling speech in a Des Moines, Iowa airfield Trump said: "Barron Trump you know he had the corona 19, the China virus. It's got 20 different names, but to me Corona means Italy.
"China is China, and it came from China so he had the china virus, right?
"And he had it for such a short period of time, I don't even think he knew he had it.
"Because they're young and their immune systems are strong and they fight it off."
He went on to say Barron, 14, had had the disease for "like two seconds" before testing negative.
Melania Trump revealed recently that her "fear came true" when Barron tested positive for Covid-19.
But, she said, "luckily he is a strong teenager and exhibited no symptoms".
"In one way I was glad the three of us went through this at the same time so we could take care of one another and spend time together," she wrote.
Coronavirus immunity might only last a few months, scientists have also found.
Research by Imperial College London estimated just 4.4 per cent of adults had some form of immunity against Covid-19 in September, when cases began to increase again.
This is compared with 6 per cent found to have antibodies between June 20 and July 13, and 4.8 per cent between July 31 and August 31.
"Look, it's called insurrection. We just send them in and we do it very easy," Trump told Fox News at the time.