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Human Herpesvirus 6: an Evolving Story
1Department of Microbiology, Osaka University Medical School, Osaka University, Osaka, Japan.
Abstract:
First isolated in 1986 from patients with lymphoproliferative disorders, human herpesvirus 6 (HHV-6) is a B-herpesvirus with two variants: HHV-6A and HHV-6B. HHV-6B is the major causal pathogen of exanthem subitum, a predominantly benign exanthematous disease of infants with occasional complications in the central nervous system. Infection with HHV-6 is common among the general population and the virus mainly seems to be transmitted from mother to infant via saliva. Following primary infection, HHV-6 persists latently and can reactivate in immunocompromised hosts, such as in individuals with AIDS or in transplant or multiple sclerosis patients where it possibly causes encephalitis and pneumonitis. Its precise role in these conditions is not well understood and further study is needed.
Insights
Human herpesvirus 6 (HHV-6), a common virus, causes infant illness and can reactivate in immunocompromised individuals. Further research is needed to understand its role in conditions like encephalitis and pneumonitis.
Area of Science:
- Virology
- Immunology
- Infectious Diseases
Background:
- Human herpesvirus 6 (HHV-6) is a B-herpesvirus with two variants, HHV-6A and HHV-6B, first identified in 1986.
- HHV-6B is the primary cause of exanthem subitum (roseola infantum) in infants, sometimes leading to central nervous system complications.
- HHV-6 infection is widespread, typically transmitted maternally via saliva, and establishes lifelong latency.
Purpose of the Study:
- To summarize the characteristics and clinical significance of human herpesvirus 6 (HHV-6).
- To highlight the role of HHV-6 in both primary infections and reactivation scenarios.
- To underscore the need for further investigation into HHV-6's pathological contributions.
Main Methods:
- Literature review and synthesis of existing data on HHV-6.
- Analysis of transmission routes and host-virus interactions.
- Review of clinical manifestations and disease associations.
Main Results:
- HHV-6 infection is highly prevalent, with transmission occurring frequently from mother to child.
- HHV-6B is a key etiological agent of exanthem subitum, a common childhood illness.
- Latent HHV-6 can reactivate in immunocompromised individuals, potentially causing severe conditions like encephalitis and pneumonitis.
Conclusions:
- HHV-6 is a significant human pathogen with diverse clinical presentations.
- The precise role of HHV-6 in severe diseases, particularly in immunocompromised patients, requires additional research.
- Understanding HHV-6 pathogenesis is crucial for managing associated health issues.