Chromosomally integrated human herpesvirus 6: questions and answers
Open accessAbstract
SUMMARY: Chromosomally integrated human herpesvirus 6 (ciHHV‐6) is a condition in which the complete HHV‐6 genome is integrated into the host germ line genome and is vertically transmitted in a Mendelian manner. The condition is found in less than 1% of controls in the USA and UK, but has been found at a somewhat higher prevalence in transplant recipients and other patient populations in several small studies. HHV‐6 levels in whole blood that exceed 5.5 log10 copies/ml are strongly suggestive of ciHHV‐6. Monitoring DNA load in plasma and serum is unreliable, both for identifying and for monitoring subjects with ciHHV‐6 due to cell lysis and release of cellular DNA. High HHV‐6 DNA loads associated with ciHHV‐6 can lead to erroneous diagnosis of active infection. Transplant recipients with ciHHV‐6 may be at increased risk for bacterial infection and graft rejection. ciHHV‐6 can be induced to a state of active viral replication in vitro . It is not known whether ciHHV‐6 individuals are put at clinical risk by the use of drugs that have been associated with HHV‐6 reactivation in vivo or in vitro . Nonetheless, we urge careful observation when use of such drugs is indicated in individuals known to have ciHHV‐6. Little is known about whether individuals with ciHHV‐6 develop immune tolerance for viral proteins. Further research is needed to determine the role of ciHHV‐6 in disease. Copyright © 2011 John Wiley & Sons, Ltd.
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There is a consensus in the literature that a whole blood viral load >5.5log10 copies/mL or serum viral load >3.5log10 copies/mL is suggestive of chromosomal integration.
“There is a consensus in the literature that a whole blood viral load >5.5log10 copies/mL or serum viral load >3.5log10 copies/mL is suggestive of chromosomal integration (14, 24, 29, 30).”
From A post-implementation evaluation of BioFire FilmArray Meningitis/Encephalitis panel for pathogen detection in cerebrospinal fluid with a special focus on clinical significance of HHV-6 (2026) · cites this paper as [29]
Table 2 and the ciHHV-6 Q&A (p. 149) support the >5.5 log10 copies/mL whole-blood threshold as suggestive of chromosomal integration. They do not give a >3.5 log10 copies/mL serum threshold; the Q&A instead says serum testing is unreliable for identifying ciHHV-6. (LLM, conf=0.90)
Experimental — accuracy not yet measuredBy analogy with antivirals used to treat CMV infections, foscarnet and ganciclovir can be administered intravenously and valganciclovir orally.
“By analogy with the antivirals used to treat CMV infections, foscarnet and ganciclovir can be administered intravenously and valganciclovir can be administered orally [15].”
From Meningoencephalitis in a background of inherited chromosomic integration of HHV-6 and CMV infection in an immunocompetent adult, which one is the culprit? (2025) · cites this paper as [15]
The section on active HHV-6 infection (page unavailable) says ganciclovir and foscarnet are approved to treat CMV and discusses valganciclovir use. It does not specify intravenous administration for foscarnet or ganciclovir, or oral administration for valganciclovir. (LLM, conf=0.86)
Experimental — accuracy not yet measuredThere is no specific, validated treatment for HHV-6 meningoencephalitis in immunocompetent adults, given the rarity of this condition.
“We lack a specific, validated treatment for HHV-6 meningoencephalitis in immunocompetent adults, given the rarity of this condition [7], [10], [15].”
From Meningoencephalitis in a background of inherited chromosomic integration of HHV-6 and CMV infection in an immunocompetent adult, which one is the culprit? (2025) · cites this paper as [15]
The “145 ciHHV-6 Q & A” section (p. 145) says HHV-6-associated disease from reactivation occurs rarely in immunocompetent individuals. The treatment sections discuss antivirals for encephalitis chiefly in post-transplant patients and mixed responses in patients with ciHHV-6. They do not establish specifically that immunocompetent adults with HHV-6 meningoencephalitis lack a validated treatment, or that rarity is the reason. (LLM, conf=0.78)
Experimental — accuracy not yet measuredDefinitive confirmation of HHV-6 chromosomal integration can be achieved by quantitative PCR testing of a nail or hair bulb sample or by droplet digital PCR on whole blood to determine the viral DNA/host DNA ratio.
“Definitive confirmation of chromosomal integration can be achieved by (i) quantitative PCR testing of a nail or hair bulb sample (because only patients with iciHHV-6 have viral DNA in these tissues) or (ii) droplet digital PCR on whole blood, in order to determine the viral DNA/host DNA ratio (1:1 for individuals with iciHHV-6) [15].”
From Meningoencephalitis in a background of inherited chromosomic integration of HHV-6 and CMV infection in an immunocompetent adult, which one is the culprit? (2025) · cites this paper as [15]
The confirmation discussion (p. 150) says PCR testing of hair follicles or nails can confirm ciHHV-6 because only affected individuals have detectable viral DNA in those tissues. The discussion on p. 149 recommends considering the viral-to-cellular DNA ratio, but does not describe droplet digital PCR or establish an exact 1:1 ratio; it says affected individuals have one or more viral copies per white blood cell. (LLM, conf=0.88)
Experimental — accuracy not yet measuredA whole blood HHV-6 viral load greater than 5.5 log10 copies/mL is much higher than that found in patients with an active primary infection and is strongly suggestive of iciHHV-6.
“although a viral load > 5.5 log10 copies/mL whole blood is much higher than that found in patients with an active primary infection and thus is strongly suggestive of iciHHV-6 [15], [17].”
From Meningoencephalitis in a background of inherited chromosomic integration of HHV-6 and CMV infection in an immunocompetent adult, which one is the culprit? (2025) · cites this paper as [15]
Approximately 1% of the population is thought to carry inherited chromosomally integrated HHV-6 (iciHHV-6).
“Approximately 1 % of the population is thought to carry iciHHV-6 [15].”
From Meningoencephalitis in a background of inherited chromosomic integration of HHV-6 and CMV infection in an immunocompetent adult, which one is the culprit? (2025) · cites this paper as [15]
In individuals with iciHHV-6, at least one copy of the HHV-6 genome is present in every cell with a 1:1 ratio of HHV-6 DNA and human cell DNA.
“In the case of iciHHV-6, at least one copy of the HHV-6 genome is present in every cell with a 1:1 ratio of HHV-6 DNA and human cell DNA.”
From Meningoencephalitis in a background of inherited chromosomic integration of HHV-6 and CMV infection in an immunocompetent adult, which one is the culprit? (2025) · cites this paper as [15]
The ten non-clinically-significant HHV-6 positive results likely reflect chromosomal integration of the virus without evidence of meningoencephalitis.
“Ten out of twelve positive results for HHV-6, of which 5 were confirmed by testing in the NVRL, were deemed not clinically significant based on clinical criteria and likely reflect chromosomal integration of the virus without evidence of meningoencephalitis [27].”
From Outcomes of implementation of the FilmArray meningoencephalitis panel in a tertiary hospital between 2017 and 2020. (2022) · cites this paper as [27]
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References 87 · Cited by 377
Research works printed but not linked: 6
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- Authors
- Pellett, P. E., Ablashi, D. V., Ambros, P. F., Agut, H., Caserta, M. T., Descamps, V., Flamand, L., Gautheret‐Dejean, A., Hall, C. B., Kamble, R. T., Kuehl, U., Lassner, D., Lautenschlager, I., Loomis, K. S., Luppi, M., Lusso, P., Medveczky, P. G., Montoya, J. G., Mori, Y., Ogata, M., Pritchett, J. C., Rogez, S., Seto, E., Ward, K. N., Yoshikawa, T., & Razonable, R. R.
- Affiliations
- Wayne State University (US)
- HHV-6 Foundation (US)
- Children's Cancer Research Institute Vienna Austria
- Pitié-Salpêtrière Hospital (FR)
- University of Rochester Medicine (US)
- Hôpital Bichat-Claude-Bernard (FR)
- Université Laval (CA)
- Service of Virology Groupe Hospitalier Pitié‐Salpêtrière Paris France
- Baylor College of Medicine (US)
- Cardiology and Pneumonology Charite University Berlin Berlin Germany
- Institute for Cardiac Diagnosis & Treatment Berlin Germany
- University of Helsinki (FI)
- University of Modena and Reggio Emilia (IT)
- National Institute of Allergy and Infectious Diseases (US)
- University of South Florida (US)
- Department of Infectious Disease Stanford University Stanford CA USA
- Kobe University (JP)
- Oita University (JP)
- Department of Virology CHRU Dupuytren Limoges France
- Moffitt Cancer Center (US)
- University College London (GB)
- Fujita Health University (JP)
- Mayo Clinic (US)
- Corresponding author
- Pellett, Philip E.
- Razonable, Raymund R.
- ORCID
- Venue
- Reviews in Medical Virology
- Publisher
- Wiley
- Published
- 2011-11-04
- Volume
- 22
- Issue
- 3
- Pages
- 144-155
- ISSN
- 1052-9276 (ISSN-L)
- 1099-1654
- PMC
- PMC3498727
- OpenAlex
- W1831137467
- Cited by
- 377
- References
- 87
- Citations by year
- 2026: 15 · 2025: 19 · 2024: 25 · 2023: 22 · 2022: 17 · 2021: 26 · 2020: 34 · 2019: 26 · 2018: 22 · 2017: 28 · 2016: 37 · 2015: 20 · 2014: 45 · 2013: 27 · 2012: 11
- FWCI
- 3.15
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Reviews in Medical Virology (publishedVersion)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- UCL Discovery (University College London) (submittedVersion)
- UNICA IRIS Institutional Research Information System (University of Cagliari) (submittedVersion)
- IRIS UNIMORE (University of Modena and Reggio Emilia) (submittedVersion, cc-by)
- Funders
- HHV-6 Foundation
- Topics
- Health Sciences › Medicine › Epidemiology › Cytomegalovirus and herpesvirus research
- Health Sciences › Medicine › Oncology › Viral-associated cancers and disorders
- Health Sciences › Medicine › Epidemiology › Herpesvirus Infections and Treatments
- Keywords
- human herpesvirus 6, vertical transmission, germ line integration, transplant recipients, graft rejection, bacterial infection risk, HHV-6 reactivation, immune tolerance
- MeSH terms
- Chromosomes, Human, Humans, Herpesvirus 6, Human, Virus Integration, Roseolovirus Infections
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