Encephalitis associated with human herpesvirus-7 infection in an immunocompetent adult.

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Abstract

Primary Human herpesvirus-7 (HHV-7) infection usually occurs during childhood and causes several clinical manifestations: mainly exanthem subitum (roseola infantum), followed by a lifelong latent state with possible reactivation in case of immunodeficiency. Nevertheless, some considerably different approaches exist regarding the natural history of HHV-7 and the possible consequences of HHV-7 infection in immunocompetent adults. In particular, little is known about its pathogenic role in central nervous system (CNS) disease in nonimmunosuppressed adults. Specifically, in case of encephalitis, it is important to distinguish between infectious encephalitis and postinfectious encephalomyelitis for the management of patients CASE PRESENTATION: We describe here a case of encephalitis associated to human herpesvirus-7 with associated polymyeloradiculopathy in an immunocompetent patient which may contribute to the delineation of the approach to a patient profile with a similar clinical presentation and evolution to those presented in the literature.

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Most cited references 11

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The management of encephalitis: clinical practice guidelines by the Infectious Diseases Society of America.

Allan Tunkel, Carol A Glaser, Karen Bloch … (2008)

Guidelines for the diagnosis and treatment of patients with encephalitis were prepared by an Expert Panel of the Infectious Diseases Society of America. The guidelines are intended for use by health care providers who care for patients with encephalitis. The guideline includes data on the epidemiology, clinical features, diagnosis, and treatment of many viral, bacterial, fungal, protozoal, and helminthic etiologies of encephalitis and provides information on when specific etiologic agents should be considered in individual patients with encephalitis.

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Molecular biology and clinical associations of Roseoloviruses human herpesvirus 6 and human herpesvirus 7.

Elisabetta Caselli, Dario di Stasio (2007)

Human herpesvirus 6 (HHV-6) and human herpesvirus 7 (HHV-7) are members of the Roseolovirus genus within the Betaherpesvirinae subfamily. HHV-6 and HHV-7 primary infection occurs in early childhood and causes short febrile diseases, sometimes associated with cutaneous rash (exanthem subitum). Both HHV-6 and HHV-7 are highly prevalent in the healthy population, establish latency in macrophages and T-lymphocytes, are frequently shed in saliva of healthy donors, and the pathogenic potential of reactivated virus ranges from asymptomatic infection to severe diseases in transplant recipients. These features have contributed to the notion that HHV-6 and HHV-7 are more or less "harmless" viruses. Consequently, the medical and scientific interest originally prompted by their discovery has been gradually waning. The aim of this review is to provide a short update of the current knowledge on these viruses, and to suggest that the medical importance of Roseoloviruses should not be understimated.

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Delayed primary HHV-7 infection and neurologic disease.

Kevin Schwartz, Susan E. Richardson, Katherine Ward … (2014)

Primary human herpesvirus 7 (HHV-7) infection occurs almost universally during the first 5 years of life and is rarely accompanied by central nervous system (CNS) symptoms such as febrile seizures. The present retrospective study investigated the role of primary HHV-7 infection in CNS disease in children, including adolescents.