Prevalence and Risk Factors of Cytomegalovirus Colitis in Inflammatory Bowel Disease Patients in Riyadh, Saudi Arabia: A Tertiary Center Experience.

Background: Patients with inflammatory bowel disease (IBD) are at a higher risk of cytomegalovirus (CMV) colitis because of their immunocompromised status. There are no studies from Saudi Arabia regarding the prevalence of CMV colitis in patients with IBD.

Objective: To determine the prevalence, characteristics, and risk factors of CMV colitis in patients with IBD in Riyadh, Saudi Arabia.

Materials and methods: This retrospective study included patients with a confirmed diagnosis of IBD (aged 14-75 years) who were followed up at King Fahad Medical City, a referral care center in Riyadh, between January 2016 and December 2021; patients with indeterminate colitis or incomplete medical records were excluded.

Results: A total of 341 patients with IBD were included, of which 236 (72.2%) had Crohn's disease (CD) and 105 (27.8%) had ulcerative colitis (UC). Qualitative CMV PCR was done for 192 patients (60 UC and 132 CD patients), of which 14 patients were positive for CMV colitis (7.3%), and all positive CMV colitis cases were among UC patients (23.3%). However, the hematoxylin and eosin (H and E) stain and immunohistochemistry were negative for all patients. Most patients with CMV colitis were on steroids (71.4%), had at least one flare-up (64.3%), and were on biologic treatment (71.4%). Significant predictors of CMV colitis were hemoglobin (OR: 0.7; 95% CI: 0.51-0.96), albumin (OR: 0.88; 95% CI: 0.78-0.98), and C-reactive protein (OR: 1.03; 95% CI: 1.01-1.06) levels.

Conclusion: This study found that the prevalence of CMV colitis was 7.3% among patients with IBD, and no case was diagnosed in patients with CD. In addition, as all cases diagnosed using qualitative CMV PCR were negative on H and E stain and immunohistochemistry, there is need for large-scale studies to improve the diagnosis of CMV colitis.