The musician, 55, discussed his agonising illness after contracting pnenumonia in both lungs, which he believes to be COVID-19, with longtime BFF and collaborator Will, 51, on Wednesday's episode of his new Snapchat series, Will From Home - teased on People.
Summertime hitmaker Jeff said he developed coronavirus-like symptoms at the end of last month, saying: 'I came home from my trip. I was like, "I feel like I'm coming down with something" and got into bed, and I don't remember the next 10 days.
'I had a temperature that reached 103. I had the chills. I lost sense of smell. I lost sense of taste.'
Will responded: 'And you couldn't even get tested!' to which Jeff responded: 'They gave me a flu test. And when I went and got the chest X-ray, she came in and said, "You have pneumonia in both your lungs"'.
He added: 'Unfortunately, people think we're at the end [of the pandemic], and I think we're really at the beginning.'
Discussing how he was alerted to Jeff's illness, Oscar nominee Will said: 'Lynette [Jeff's wife] called me and Lynette doesn't panic and she called with panic vibes.'
Will teamed up with Jazz, real name Jeffrey Townes, when they were both trying break into the big time in West Philadelphia's local hip hop scene in the 1980s.
They became local stars after adding the now forgotten beatboxer Clarence 'Ready Rock C' Holmes to the line-up, though he ended up splitting in 1990 before later unsuccessfully suing his old pals.