Abstract
An interaction between infection and IBD was identified soon after Crohn's disease and ulcerative colitis were first described. Since then it has become apparent that infectious agents are involved with both the etiopathogenesis and clinical course of IBD on several levels. Whilst our understanding of this interplay is incomplete, it is clear that infections can initiate both the onset and relapse of IBD. Furthermore, the disease process itself predisposes patients to certain infections, and many drugs used to treat IBD also increase the risk of infectious complications. Attempts to establish the relative infectious risks associated with the drugs used to treat IBD remain in an early stage; but it seems that the greatest risks relate to the combined use of immunomodulating agents rather than to individual drugs. The risk of infections in patients with IBD might also be exacerbated by underuse of, and perhaps substandard response to, vaccinations. It is axiomatic that physicians treating patients with IBD must be aware of these infectious risks and of strategies to minimize them. Meanwhile, intriguing advances in the use of parasitic agents as a treatment for ulcerative colitis and Crohn's disease have introduced a new angle to the interplay between infections and IBD.
Key Points
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Infection can initiate the onset of IBD, but it is unlikely that IBD is caused by a single pathogenic agent
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Relapse of IBD is also associated with intercurrent infection, which should be looked for in all patients presenting with active IBD: treatment of infections might avoid inappropriate or unnecessary use of steroids, immunomodulators or biologics
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IBD can predispose to infectious complications, either directly as part of the disease process (e.g. abscess formation in Crohn's disease) or indirectly (e.g. by causing malnutrition)
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Many drugs used to treat IBD predispose patients to infection: it remains unclear which individual drugs carry the highest risk, but the use of these drugs in combination clearly increases the risk of infection
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The use of screening tests and, where appropriate, prophylactic therapy or vaccination decreases the risk of therapy-associated infections
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Nonpathogenic parasites represent a new and apparently safe form of therapy for IBD
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Peter R Gibson is a Consultant for Abbott Australasia, Centocor, Falk Pharma, Ferring Pharmaceuticals, Pharmatel Fresenius Kabi, Orphan Australia, Nycomed and Schering Plough. He is a Speaker for Ferring Pharmaceuticals and Pharmatel Fresenius Kabi, and has received grant/research support Ferring Pharmaceuticals, Pharmatel Fresenius Kabi and Nycomed. Peter M Irving declared no competing interests.
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Irving, P., Gibson, P. Infections and IBD. Nat Rev Gastroenterol Hepatol 5, 18–27 (2008). https://doi.org/10.1038/ncpgasthep1004
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DOI: https://doi.org/10.1038/ncpgasthep1004
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