Furthermore, a reduced abundance of butyrate-producing genera has been shown to facilitate the establishment of enteric pathogens in animal models [88,89], and it has been associated with markers of systemic inflammation, e.g., C-reactive protein (CRP) in people living with inflammatory bowel diseases such as Crohn’s [90] and ulcerative colitis (UC) [91]. This evidence concerns the gene CRP and ulcerative colitis.