The former X Factor judge was forced to take a break from hosting her new TalkTV show just three days after its launch so she could fly home to be with Ozzy.
However, she later told co-star Jeremy Kyle via video call that her “entire household” had subsequently tested positive.
Despite feeling “fine” earlier this week, Sharon has now shared a picture of herself on social media in bed with a drip connected to her arm.
She captioned her post with some angry swearing emojis.
Sharon previously tested positive for the virus in December 2020 and spent a brief period in hospital.
Last week, the star – who is one of the faces of the new TalkTV channel launched by News UK earlier this month – vowed to return to her show The Talk as soon as possible.
Of missing her show, Sharon added: “I can’t believe my luck. I’m missing the show and I’ve only been there three days. Three days and I’m missing the show but I will be back. I know I will.
“It will take me a week to get my old man back on his feet again and I will be back.”
Earlier this week, Sharon said the Black Sabbath star was now “on the mend”.
The Talk airs weeknights at 9pm on TalkTV and YouTube.