Opportunistic Infections Are More Prevalent in Crohn

Sheriff MZ1, Mansoor E2, Luther J3, Ananthakrishnan AN3, Abou Saleh M1, Ho E2, Briggs FBS4, Dave M2. Inflamm Bowel Dis. 2019 Jul 17. pii: izz147. doi: 10.1093/ibd/izz147. [Epub ahead of print]


Author information

Department of Internal Medicine, University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, Ohio, USA.

Division of Gastroenterology and Liver Disease, University Hospitals Cleveland Medical Center, Case Western Reserve University, Cleveland, Ohio, USA.

Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts.

Department of Population and Quantitative Health Sciences, School of Medicine, Case Western Reserve University, Cleveland, Ohio, USA.


BACKGROUND: Opportunistic infections (OIs) are more common in patients with inflammatory bowel disease (IBD); however, there have been limited large-scale studies of OIs in IBD. We investigated the epidemiological characteristics of OI in Crohn's disease (CD) and ulcerative colitis (UC) using a large population-based database.

METHODS: Data were collected from a commercial database (Explorys Inc., Cleveland, OH, USA) that provided electronic health records from 26 major integrated US health care systems from 1999 to March 2018. In this data set, we identified all CD and UC patients, based on Systemized Nomenclature of Medicine-Clinical Terms. Within these cohorts, we identified a variety of OIs and compared the prevalence rate of OI in individuals with IBD with that of controls (patients in the database between March 2013 and March 2018 without the diagnosis of IBD).

RESULTS: Explorys included 153,290 patients with CD and 128,540 patients with UC between March 2013 and March 2018. The prevalence of OIs was 17.8% in CD, 19.2% in UC, and 7% in non-IBD controls. When compared with non-IBD controls, all OIs were more common in CD (prevalence ratio [PR], 2.54; 95% confidence interval [CI], 2.51-2.57) and UC (PR, 2.74; 95% CI, 2.71-2.77). Overall, viral infections were numerically more common, whereas bacterial infections had the highest PRs in CD and UC when compared with controls without IBD.

CONCLUSIONS: We found significantly higher rates of OI in IBD. Our study suggests the need for close follow-up of IBD patients to diagnose and provide vaccinations where applicable for prevention of infections.

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