A six-year-old with cystic fibrosis has shared a video celebrating that he beat Covid-19.

In a viral video posted by his mother, the boy from Tennessee said: "Thank you for all the cards and the prayers and the gifts. I'm a cystic fibrosis warrior and I beat Covid-19."

Joseph Bostain's disease causes the body to produce thick and sticky mucus that can clog the lungs and obstruct the pancreas.

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His condition, coupled with the coronavirus, makes him one of the most high-risk people to die from the illness, as the virus attacks the lungs, leading to shortness of breath and respiratory failure.

However, he recovered from the virus in a two-week battle.

According to his mother, Sabrina, Joseph was quarantined in their Clarksville home after coming down with a fever and cough.

He was then taken to Monroe Carroll Jr Children's Hospital, where he was diagnosed with Covid-19 on March 19.

Throughout the two-week quarantine, Joseph's mother posted updates on Facebook of his condition.

Update today! Joseph is feeling so much better! The only residue left would be a cough that is better and some tummy...

Posted by Sabrina Bostain on Monday, 30 March 2020

"We have wonderful care providers and most importantly we have a MIGHTY GOD," she wrote at the time.

"Stay well and wash and sanitise and please if u are sick stay home and away from elderly and those who u know are immune-compromised!!"

It wasn't until March 28 that his fever broke.

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UPDATE ON JOSEPH:: FEVER FREE!!!!!🙏🏼🙏🏼🙏🏼 Joseph had a good nights sleep with reduced cough! We are having incontinence...

Posted by Sabrina Bostain on Saturday, 28 March 2020

"Joseph had a good nights sleep with a reduced cough! We are having incontinence with bowels and a cough but cough seems to be calming down! We are on the home stretch of this virus and the fever-free countdown can begin!" she wrote.

Covid19.govt.nz: The Government's official Covid-19 advisory website

"13 days left and we will be past COVID 19!! I am praying for everyone to stay healthy and well and I thank every single person who has prayed and cheered Joseph on!"

On April 1, she posted the good news that he had recovered with the caption: "Today Joseph can tell you how he is doing himself!"

The US death toll has reached at least 9633 and there are more than 337,000 confirmed cases – more than any other nation is reporting.

Tennessee Governor Bill Lee has issued a statewide stay-at-home order to try and slow the spread of the virus.

The state has at least 3392 confirmed cases.