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Human herpesvirus 6 infection and associated pathogenesis following bone marrow transplantation
1Department of Surgery, University of Pittsburgh Cancer Institute, PA 15261, USA.
Abstract:
Human herpesvirus 6 (HHV-6) infections following bone marrow transplantation (BMT) have been shown to be associated with fever, skin rash, graft versus host disease, encephalitis, delay in engraftment, marrow suppression, and pneumonia. Unfortunately several of these studies were case reports and although the results were suggestive they prompted us to study these pathological events systematically. These associations were primarily based on either HHV-6 isolation, HHV-6 DNA detection, antigen detection or increases in HHV-6 specific antibodies. HHV-6 activity was more frequent during the post- rather than the pre-transplantation period. All HHV-6 isolates from BMT patients have been shown to be variant B. A better understanding of HHV-6 associated pathogenesis gained by larger prospective trials is needed to facilitate proper treatment of cases of idiopathic illnesses or those associated with symptoms (fever, skin rash) similar to those caused by HHV-6.
Insights
Human herpesvirus 6 (HHV-6) infections are linked to complications after bone marrow transplantation (BMT). Further research is needed to understand HHV-6 pathogenesis and guide treatment for related symptoms.
Area of Science:
- Infectious Diseases
- Hematology
- Virology
Background:
- Human herpesvirus 6 (HHV-6) infections are frequently observed following bone marrow transplantation (BMT).
- Previous studies, often case reports, suggested associations between HHV-6 and various post-transplant complications.
- These complications include fever, skin rash, graft-versus-host disease, encephalitis, delayed engraftment, marrow suppression, and pneumonia.
Purpose of the Study:
- To systematically investigate the pathological events associated with HHV-6 infections post-BMT.
- To characterize the clinical significance of HHV-6 activity in BMT recipients.
Main Methods:
- Associations were determined through HHV-6 isolation, DNA detection, antigen detection, and monitoring of specific antibody increases.
- Patient data and viral activity were analyzed in relation to transplantation periods (pre- vs. post-transplant).
Main Results:
- HHV-6 activity was more prevalent in the post-transplantation period compared to the pre-transplantation period.
- All HHV-6 isolates identified in BMT patients were confirmed as variant B.
- The study systematically evaluated previously suggested associations between HHV-6 and BMT complications.
Conclusions:
- A clearer understanding of HHV-6 associated pathogenesis in BMT recipients is crucial.
- Larger prospective trials are necessary to confirm findings and guide effective treatment strategies.
- Improved knowledge will aid in managing idiopathic illnesses or symptoms mimicking HHV-6 infections post-BMT.