Steroid Resistance/Dependence Might Be an Alarming Feature for Cytomegalovirus Infection Among Ulcerative Colitis Patients With Increased Disease Activity

Background/Aims This study aimed to determine the prevalence of cytomegalovirus (CMV) infection among patients with moderate to severe active ulcerative colitis (UC) and to determine the risk factors for CMV infection according to the demographic features of these patients.Patients/Methods A total of 183 patients with severe or moderate active UC were enrolled in the study after retrospective analysis. The disease severity of UC was determined according to the Mayo Score. CMV infection was investigated by real-time quantitative polymerase chain reaction (PCR) and the immunohistochemical (IHC) staining method in colonic mucosal biopsies.Results CMV infection was diagnosed in 33.9% of patients with UC. UC patients diagnosed with CMV infection had significantly higher Mayo Score levels (9.68 vs 8.56 and p=0.001). The long-term presence of UC disease, steroid, azathioprine (AZA), and anti-tumor necrosis factor-alpha (anti-TNF-alpha) usage increased the risk of CMV infection (p=0.001 and odds ratio=1.168; p=0.001 and odds ratio=2.967; p=0.004 and odds ratio=2.953; p=0.003 and odds ratio=3.861, respectively). CMV infection increases the risk of developing steroid resistance or dependency (p=0.002 and odds ratio=3.147; p=0.002 and odds ratio=5.085, respectively). Post-treatment clinical remission and mucosal healing rates were higher in CMV-negative patients than in CMV-positive patients (99.2% vs 91.9%, p=0.018 and 86.8% vs 70.9%, p=0.015). A higher rate of need for colectomy had been found in patients with CMV infection (5 patients vs 1 patient; p=0.034 and odds ratio=10.526).Conclusions The presence of CMV infection increases the severity of the disease and worsens clinical outcomes, leading to adverse treatment outcomes. CMV infection increases the requirement for colectomy. The presence of steroids, immunosuppressives such as AZA, and anti-TNF-alpha usage increases the occurrence of CMV infection. CMV infection should be suspected in patients with moderate to severe UC activity.