YES! I had developed SIBO shortly after having Covid. Two weeks to be exact. I was on Xifaxan for a month. It helped the bacteria go away but I still had abdominal pain and abdominal bloating. My bowel movements ranged from brown to light brown regardless of what I ate. I chronically have right sided pain but all my scans looked normal. I have had THREE abd MRIS's. Its just all too crazy how my athletic self declined so much since having the virus.