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Abstract
Herpesviruses such as herpes simplex virus (HSV) type 1 and 2, varicella-zoster virus (VZV), and cytomegalovirus (CMV) maintain lifelong latency in the host after primary infection and can reactivate periodically either as asymptomatic viral shedding or as clinical disease. Immunosuppression, including biologic therapy, may increase frequency and severity of herpesvirus reactivation and infection. Licensed biologics are reviewed regarding their risks of potentiating HSV, VZV, and CMV reactivation and infection. Approaches to prophylaxis against HSV, VZV, and CMV infection or reactivation are discussed.
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Affiliation(s)
- Dora Y Ho
- Division of Infectious Diseases and Geographic Medicine, Department of Medicine, Stanford University School of Medicine, 300 Pasteur Drive, Lane Building L-135, Stanford, CA 94305-5107, USA.
| | - Kyle Enriquez
- Stanford University, 450 Serra Mall, Stanford, CA 94305, USA
| | - Ashrit Multani
- Division of Infectious Diseases, Department of Medicine, David Geffen School of Medicine at UCLA, 10833 Le Conte Avenue CHS 37-121, Los Angeles, CA 90095-1688, USA
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Da Cunha T, Wu GY. Cytomegalovirus Hepatitis in Immunocompetent and Immunocompromised Hosts. J Clin Transl Hepatol 2021; 9:106-115. [PMID: 33604261 PMCID: PMC7868697 DOI: 10.14218/jcth.2020.00088] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 11/22/2020] [Accepted: 12/08/2020] [Indexed: 12/25/2022] Open
Abstract
Human cytomegalovirus (HCMV) infection is common and affects between 40-100% of the worldwide population. However, the majority of cases are asymptomatic and when severe disease occurs, it is usually restricted to immunocompromised patients. Liver involvement by HCMV differs significantly, accordingly to the immune status of the host. In immunocompromised patients, particularly liver transplant patients, it often causes clinically significant hepatitis. On the other hand, in immunocompetent patients, HCMV hepatitis requiring hospitalization is extremely rare. This review aims to appraise studies regarding the pathophysiology of HCMV hepatitis, including mechanisms of latency and reactivation and its contribution to disease development, clinical presentation, diagnostic modalities and treatment, with a focus on comparing different aspects between immunocompromised and immunocompetent hosts.
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Affiliation(s)
- Teresa Da Cunha
- Department of Medicine, Division of Gastroenterology-Hepatology, University of Connecticut Health Center, Farmington, CT, USA
- Correspondence to: Teresa Da Cunha, Department of Medicine, University of Connecticut Health Center, Farmington, CT 06030, USA. Tel: +1-860-706-2133, Fax: +1-860-679-3159, E-mail:
| | - George Y. Wu
- Department of Medicine, Division of Gastroenterology-Hepatology, University of Connecticut Health Center, Farmington, CT, USA
- Current address: Department of Medicine, University of Connecticut Health Center, Farmington, CT, USA
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Shukla T, Singh S, Tandon P, McCurdy JD. Corticosteroids and Thiopurines, But Not Tumor Necrosis Factor Antagonists, are Associated With Cytomegalovirus Reactivation in Inflammatory Bowel Disease: A Systematic Review and Meta-Analysis. J Clin Gastroenterol 2017; 51:394-401. [PMID: 27875356 DOI: 10.1097/mcg.0000000000000758] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
BACKGROUND The association between cytomegalovirus (CMV) reactivation and individual immunosuppressive agents in inflammatory bowel disease (IBD) has not been clearly defined. Therefore, we performed a systematic review and meta-analysis to assess this association. METHODS Multiple electronic databases were searched systematically through July 2015 for observational studies reporting CMV reactivation (based on serum-based or tissue-based tests) in IBD patients stratified by medication exposure. We estimated summary odds ratios (ORs) and 95% confidence intervals (CI) using random-effects model. Study quality was assessed using the Newcastle-Ottawa scale. RESULTS Sixteen observational studies were identified. As compared with nonexposed patients, exposure to corticosteroids (CS) (12 studies, 1180 patients, 52.3% exposed; OR, 2.05; 95% CI, 1.40-2.99) and thiopurines (14 studies, 1273 patients, 24.1% exposed; OR, 1.56; 95% CI, 1.01-2.39) was associated with increased risk of CMV reactivation. In contrast, as compared with patients not exposed to tumor necrosis factor (TNF) antagonists, exposure to TNF antagonists was not associated with an increased risk of CMV reactivation (7 studies, 818 patients, 18.5% exposed; OR, 1.44; 95% CI, 0.93-2.24). The results remained stable for CS and thiopurines when the analysis was limited to hospitalized patients, and by a tissue-based diagnosis. Studies were limited in the ability to assess the impact of concomitant immunosuppressive therapy, duration of medication exposure, and disease severity. CONCLUSIONS On the basis of 16 observational studies, exposure to CS or thiopurines, but not TNF antagonists, was associated with an increased risk of CMV reactivation in IBD patients.
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Affiliation(s)
- Tushar Shukla
- *Division of Gastroenterology and Hepatology, The Ottawa Hospital, Ottawa, ON, Canada †Division of Gastroenterology, University of California San Diego, La Jolla, CA
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Pillet S, Jarlot C, Courault M, Del Tedesco E, Chardon R, Saint-Sardos P, Presles E, Phelip JM, Berthelot P, Pozzetto B, Roblin X. Infliximab Does Not Worsen Outcomes During Flare-ups Associated with Cytomegalovirus Infection in Patients with Ulcerative Colitis. Inflamm Bowel Dis 2015; 21:1580-6. [PMID: 25933392 DOI: 10.1097/mib.0000000000000412] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
BACKGROUND Immunosuppressive therapies used for treating ulcerative colitis are known to favor chronic and latent viral diseases. This study aimed at evaluating prospectively the association between colonic cytomegalovirus (CMV) reactivation and anti-tumor necrosis factor (TNF) monoclonal antibodies (mabs) by comparison to azathioprine (AZA) in a series of flare-ups occurring in consecutive ulcerative colitis patients. METHODS A total of 109 flare-ups were recorded in 73 patients receiving a maintenance therapy by anti-TNF mabs (n = 69) or AZA (n = 40). The CMV DNA load in colonic tissue was determined by reverse transcription polymerase chain reaction on a pair of biopsies. RESULTS The number of CMV reactivation was of 35% and 38% in patients receiving anti-TNF mabs and AZA, respectively. The median of CMV DNA load was 378 [10-29,800] and 8300 [10-3,25,000] copies/mg of tissue in patients treated by anti-TNF mabs and AZA, respectively (P = 0.11 by Mann-Whitney U test). In a subgroup of 45 patients under anti-TNF mabs requiring an optimized treatment by infliximab, clinical remission (partial Mayo score <3) was not significantly impacted by the presence of CMV reactivation at the time of flare-up (P = 0.52). Twenty of these patients underwent a second colonic biopsy 8 weeks after the initiation of flare-up therapy; except for 3 patients, the colonic CMV DNA load was stable or decreased. CONCLUSIONS Patients under anti-TNF maintenance therapy are not at higher risk of CMV reactivation in case of flare-up. No reciprocal adverse influence was observed between anti-TNF mabs and CMV infection, suggesting that these drugs must be considered for treating flare-ups associated to CMV reactivation.
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Affiliation(s)
- Sylvie Pillet
- *EA-3064, Groupe Immunité des Muqueuses et Agents Pathogènes (GIMAP), Faculty of Medicine of Saint-Etienne, University of Lyon, Lyon, France; †Laboratory of Infectious Agents and Hygiene, University Hospital of Saint-Etienne, France; ‡Department of Gastroenterology, University Hospital of Saint-Etienne, France; and §Inserm, CIE3, F-42055 Saint-Etienne, France
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Ali T, Kaitha S, Mahmood S, Ftesi A, Stone J, Bronze MS. Clinical use of anti-TNF therapy and increased risk of infections. Drug Healthc Patient Saf 2013; 5:79-99. [PMID: 23569399 PMCID: PMC3615849 DOI: 10.2147/dhps.s28801] [Citation(s) in RCA: 157] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Biologics such as antitumor necrosis factor (anti-TNF) drugs have emerged as important agents in the treatment of many chronic inflammatory diseases, especially in cases refractory to conventional treatment modalities. However, opportunistic infections have become a major safety concern in patients on anti-TNF therapy, and physicians who utilize these agents must understand the increased risks of infection. A literature review of the published data on the risk of bacterial, viral, fungal, and parasitic infections associated with anti-TNF therapy was performed and the clinical presentation, diagnostic tests, management, and prevention of opportunistic infections in patients receiving anti-TNF therapy were reviewed. Awareness of the therapeutic potential and associated adverse events is necessary for maximizing therapeutic benefits while minimizing adverse effects from anti-TNF treatments. Patients should be adequately vaccinated when possible and closely monitored for early signs of infection. When serious infections occur, withdrawal of anti-TNF therapy may be necessary until the infection has been identified and properly treated.
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Affiliation(s)
- Tauseef Ali
- OU Physicians Center for Inflammatory Bowel Disease, University of Oklahoma Health Sciences Center
- Department of Internal Medicine, University of Oklahoma Health Sciences Center
| | - Sindhu Kaitha
- Department of Internal Medicine, University of Oklahoma Health Sciences Center
| | - Sultan Mahmood
- Department of Internal Medicine, University of Oklahoma Health Sciences Center
| | - Abdul Ftesi
- Integris Baptist Hospital, Oklahoma City, Oklahoma, USA
| | - Jordan Stone
- Department of Internal Medicine, University of Oklahoma Health Sciences Center
| | - Michael S Bronze
- Department of Internal Medicine, University of Oklahoma Health Sciences Center
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Cavallo R. The laboratory of clinical virology in monitoring patients undergoing monoclonal antibody therapy. Clin Microbiol Infect 2011; 17:1781-5. [DOI: 10.1111/j.1469-0691.2011.03678.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Davignon JL, Boyer JF, Jamard B, Nigon D, Constantin A, Cantagrel A. Maintenance of cytomegalovirus-specific CD4pos T-cell response in rheumatoid arthritis patients receiving anti-tumor necrosis factor treatments. Arthritis Res Ther 2010; 12:R142. [PMID: 20633267 PMCID: PMC2945035 DOI: 10.1186/ar3083] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2010] [Revised: 05/26/2010] [Accepted: 07/15/2010] [Indexed: 01/15/2023] Open
Abstract
INTRODUCTION Anti-tumor necrosis factor (TNF)-α biotherapies have considerably changed the treatment of rheumatoid arthritis (RA). However, serious infections are a major concern in patients with rheumatic diseases treated with anti-TNF-α. Little is known about viral, especially latent, infections in anti-TNF-α treatments. Infections by cytomegalovirus (CMV), a β-herpes virus, are frequent and induce a strong CD4pos T-cell immunity, which participates in the control of infection. We thus have chosen to analyze the CD4pos T-cell response to CMV antigens as a model of antiviral response in RA patients treated with anti-TNF-α. CD28 expression was evaluated. METHODS We have measured the CD4pos response to CMV antigens in RA patients, before and after initiation of treatment with an anti-TNF-α agent. The intracellular production of interferon (IFN)-γ in total and CD28neg CD4pos T cells in response to CMV antigens (Ags) was evaluated with flow cytometry. The proliferation of total CD4pos T cells in the presence of CMV antigens was measured with 3H-thymidine incorporation. RESULTS Anti-TNF-α treatments impaired neither the anti-CD4pos anti-CMV IFN-γ response nor the proliferative response in patients. The percentage of CD28neg CD4pos cells remained constant. CONCLUSIONS Our data suggest that the CD4pos T-cell response against CMV is not altered by anti-TNF-α treatments and that infection remains controlled in treated RA patients latently infected with CMV. Our observation brings new insight into the current knowledge of the risks of infection in patients treated with anti-TNF-α biotherapies.
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Abstract
Tumor necrosis factor (TNF) blockers are widely used to treat rheumatoid arthritis and other chronic inflammatory diseases. Many studies have demonstrated an increased risk of opportunistic infections such as tuberculosis and fungal infection in patients treated with TNF blockers, which is thought to be related to the primary role of TNF both in host defense and in the immune response. Little is known, however, about the association between TNF blockade and the development of viral infection. Owing to the critical role of TNF in the control of viral infection, depletion of this cytokine with TNF blockers could facilitate the development or reactivation of viral infection. A number of large observational studies have found an increased risk of herpes zoster in patients receiving TNF blockers for the treatment of rheumatoid arthritis. This Review draws attention to the risk of several viral infections, including HIV, varicella zoster virus, Epstein-Barr virus, cytomegalovirus, and human papillomavirus, in patients receiving TNF-blocking therapy for chronic inflammatory conditions. In addition, implications for clinical practice and possible preventative approaches are discussed.
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Shale MJ, Seow CH, Coffin CS, Kaplan GG, Panaccione R, Ghosh S. Review article: chronic viral infection in the anti-tumour necrosis factor therapy era in inflammatory bowel disease. Aliment Pharmacol Ther 2010; 31:20-34. [PMID: 19681818 DOI: 10.1111/j.1365-2036.2009.04112.x] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Anti-tumour necrosis factor (TNF) therapy is now well established in the treatment of inflammatory bowel disease and the risk of opportunistic infection is recognized. However, specific considerations regarding screening, detection, prevention and treatment of chronic viral infections in the context of anti-TNF therapy in inflammatory bowel disease are not widely adopted in practice. AIM To provide a detailed and comprehensive review of the relevance of chronic viral infections in the context of anti-TNF therapy in inflammatory bowel disease. METHODS Literature search was conducted using Medline, Pubmed and Embase using the terms viral infection, hepatitis, herpes, CMV, EBV, HPV, anti-TNF, infliximab, adalimumab, certolizumab pegol and etanercept. Hepatitis B and C and HIV had the largest literature associated and these have been summarized in Tables. RESULTS Particular risks are associated with the use of anti-TNF drugs in patients with hepatitis B infection, in whom reactivation is common unless anti-viral prophylaxis is used. Reactivation of herpes zoster is the most common viral problem associated with anti-TNF treatment, and may be particularly severe. Primary varicella infection may present with atypical features in patients on anti-TNF. CONCLUSION Appreciation of risks of chronic viral disease associated with anti-TNF therapy may permit early recognition, prophylaxis and treatment.
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Affiliation(s)
- M J Shale
- GI Section, Imperial College London, London, UK
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Cantini F, Nannini C, Niccoli L. Bioboosters in the treatment of rheumatic diseases: a comprehensive review of currently available biologics in patients with rheumatoid arthritis, ankylosing spondylitis and psoriatic arthritis. Open Access Rheumatol 2009; 1:163-178. [PMID: 27789989 PMCID: PMC5074719 DOI: 10.2147/oarrr.s4490] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Immunologic research has clarified many aspects of the pathogenesis of inflammatory rheumatic disorders. Biologic drugs acting on different steps of the immune response, including cytokines, B- and T-cell lymphocytes, have been marketed over the past 10 years for the treatment of rheumatoid arthritis (RA), ankylosing spondylitis (AS), and psoriatic arthritis (PsA). Randomized controlled trials (RCTs) of anti-cytokine agents in RA (including the anti-tumor necrosis factor alpha (TNFα) drugs infliximab, etanercept, adalimumab, golimumab, certolizumab, anti-interleukin (IL)-1 anakinra, and anti-IL-6 tocilizumab) demonstrated a significant efficacy compared to traditional therapies, if combined with methotrexate (MTX), as measured by ACR 20, 50 and 70 response criteria. The new therapies have also been demonstrated to be superior to MTX in slowing or halting articular damage. RCTs have shown the efficacy of anti-TNFα in AS patients through significant improvement of symptoms and function. Trials of anti-TNFα in PsA patients showed marked improvement of articular symptoms for psoriasis and radiological disease progression. More recent studies have demonstrated the efficacy of B-cell depletion with rituximab, and T-cell inactivation with abatacept. All these drugs have a satisfactory safety profile. This paper reviews the different aspects of efficacy and tolerability of biologics in the therapy of RA, AS, and PsA.
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Affiliation(s)
- Fabrizio Cantini
- Second Division of Medicine, Rheumatology Unit, Hospital of Prato, Italy
| | - Carlotta Nannini
- Second Division of Medicine, Rheumatology Unit, Hospital of Prato, Italy
| | - Laura Niccoli
- Second Division of Medicine, Rheumatology Unit, Hospital of Prato, Italy
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Domm S, Cinatl J, Mrowietz U. The impact of treatment with tumour necrosis factor-alpha antagonists on the course of chronic viral infections: a review of the literature. Br J Dermatol 2008; 159:1217-28. [PMID: 18945310 DOI: 10.1111/j.1365-2133.2008.08851.x] [Citation(s) in RCA: 126] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Biologics that antagonize the biological activity of tumour necrosis factor (TNF)-alpha, namely infliximab, etanercept and adalimumab, are increasingly used for treatment of immune-mediated inflammatory diseases, including psoriasis, worldwide. TNF-alpha antagonists are known to increase the risk of reactivation and infection, particularly of infections with intracellular bacteria such as Mycobacterium tuberculosis. More frequently these agents are given to patients with viral infections. Viral hepatitis and human immunodeficiency virus infections are often present in these patients, with a considerable geographical variation. Other concomitant viral infections such as herpes, cytomegalovirus and varicella zoster virus may occur much more frequently than tuberculosis or leprosy. General recommendations about the management related to possible problems associated with anti-TNF-alpha treatment and these viral infections are lacking. This short review will give an overview of the most recent data available on the effects of anti-TNF-alpha therapy on viral infections with a particular focus on patient management and screening recommendations.
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Affiliation(s)
- S Domm
- Psoriasis-Center at the Department of Dermatology, University Medical Center Schleswig-Holstein, Campus Kiel, Schittenhelmstr. 7, 24105 Kiel, Germany.
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Britt W. Manifestations of human cytomegalovirus infection: proposed mechanisms of acute and chronic disease. Curr Top Microbiol Immunol 2008; 325:417-70. [PMID: 18637519 DOI: 10.1007/978-3-540-77349-8_23] [Citation(s) in RCA: 224] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Infections with human cytomegalovirus (HCMV) are a major cause of morbidity and mortality in humans with acquired or developmental deficits in innate and adaptive immunity. In the normal immunocompetent host, symptoms rarely accompany acute infections, although prolonged virus shedding is frequent. Virus persistence is established in all infected individuals and appears to be maintained by both a chronic productive infections as well as latency with restricted viral gene expression. The contributions of the each of these mechanisms to the persistence of this virus in the individual is unknown but frequent virus shedding into the saliva and genitourinary tract likely accounts for the near universal incidence of infection in most populations in the world. The pathogenesis of disease associated with acute HCMV infection is most readily attributable to lytic virus replication and end organ damage either secondary to virus replication and cell death or from host immunological responses that target virus-infected cells. Antiviral agents limit the severity of disease associated with acute HCMV infections, suggesting a requirement for virus replication in clinical syndromes associated with acute infection. End organ disease secondary to unchecked virus replication can be observed in infants infected in utero, allograft recipients receiving potent immunosuppressive agents, and patients with HIV infections that exhibit a loss of adaptive immune function. In contrast, diseases associated with chronic or persistent infections appear in normal individuals and in the allografts of the transplant recipient. The manifestations of these infections appear related to chronic inflammation, but it is unclear if poorly controlled virus replication is necessary for the different phenotypic expressions of disease that are reported in these patients. Although the relationship between HCMV infection and chronic allograft rejection is well known, the mechanisms that account for the role of this virus in graft loss are not well understood. However, the capacity of this virus to persist in the midst of intense inflammation suggests that its persistence could serve as a trigger for the induction of host-vs-graft responses or alternatively host responses to HCMV could contribute to the inflammatory milieu characteristic of chronic allograft rejection.
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Affiliation(s)
- W Britt
- Department of Pediatrics, University of Alabama School of Medicine, Childrens Hospital, Harbor Bldg. 104, 1600 7th Ave. South Birmingham, AL 35233, USA.
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Sari I, Birlik M, Gonen C, Akar S, Gurel D, Onen F, Akkoc N. Cytomegalovirus colitis in a patient with Behcet’s disease receiving tumor necrosis factor alpha inhibitory treatment. World J Gastroenterol 2008; 14:2912-4. [PMID: 18473420 PMCID: PMC2710737 DOI: 10.3748/wjg.14.2912] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Anti-tumor necrosis factor alpha (TNF-α) inhibitors are effective in the treatment of various inflammatory rheumatic conditions. Increased risks of serious infections are the major issues concerning the long-term safety of these agents. We present a case of a young male Behcet’s patient whose disease was complicated by cytomegalovirus (CMV) colitis. Colitis started 10 d after the third Infliximab dose and responded to the cessation of TNF blocking treatment and administration of ganciclovir. Tumor necrosis factor alpha and interferon gamma act at several levels in combating viral infections. CMV infections should be kept in mind and included in the differential diagnosis of severe gastrointestinal symptoms in patients receiving anti-TNF agents.
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Prise en charge de l’infection à cytomégalovirus symptomatique chez les patients traités par immunosuppresseurs pour une maladie inflammatoire chronique. Rev Med Interne 2008; 29:305-10. [DOI: 10.1016/j.revmed.2007.10.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2007] [Accepted: 10/04/2007] [Indexed: 11/20/2022]
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Kuo CP, Wu CL, Ho HT, Chen C, Liu SI, Lu YT. Detection of cytomegalovirus reactivation in cancer patients receiving chemotherapy. Clin Microbiol Infect 2008; 14:221-7. [DOI: 10.1111/j.1469-0691.2007.01895.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Kohara MM, Blum RN. Cytomegalovirus ileitis and hemophagocytic syndrome associated with use of anti-tumor necrosis factor-alpha antibody. Clin Infect Dis 2006; 42:733-4. [PMID: 16447129 DOI: 10.1086/500262] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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