Brock Lesnar’s Illness Is Intestinal Infection

Sherdog.com with the update:

Mike Fagan of Bloody Elbow had this to say:

Cursory research provides the following. Bacterial gastroenteritis generally improves with replacement of fluids within a week, though “rare cases of kidney failure or death” have been reported. The infection can be caused by E. Coli, but Medicenet.com states “Enterocolitis caused by the bacterium Clostridium difficile is unusual because it often is caused by antibiotic treatment.

So it seems possible that Lesnar had some sort of smaller issue that required antibiotics and then picked up an intestinal infection like clostridium difficile from the meds.