Human Herpesviruses 6, 7, and 8

Philip E. Pellett; Graham Tipples

doi:10.1128/9781555816728.ch100

Chapter 100 : Human Herpesviruses 6, 7, and 8

Authors: Philip E. Pellett, Graham Tipples

Content Type: Reference

Publication Year: 2011

Category: Clinical Microbiology

Book DOI: 10.1128/9781555816728

Chapter DOI: 10.1128/9781555816728.ch100

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Abstract:

The viruses discussed in this chapter are Human herpesvirus 6 variants A and B (HHV-6A and HHV-6B), Human herpesvirus 7 (HHV-7), and Human herpesvirus 8 (HHV-8; Kaposi's sarcoma [KS]-associated herpesvirus). These viruses cause diseases that are clinically significant primarily in small children and in immunocompromised patients. HHV-6A and HHV-6B, along with HHV-7, comprise the Roseolovirus genus of the betaherpesvirus subfamily. Roseoloviruses share many features of their genomic architecture and genetic content, the ability to replicate and establish latent infections in lymphocytes, and associations with febrile rash illnesses in young children, and they are opportunistic pathogens in immunocompromised patients. Collectively, HHV-6A and HHV-6B are highly prevalent, with seroprevalences in many populations exceeding 90%. During primary infection in young children in the United States, HHV-6A was found by polymerase chain reaction (PCR) in 2.5% of peripheral blood mononuclear cell (PBMC) and 17% of cerebrospinal fluid (CSF) specimens, while HHV-6B was found in 99% of PBMC and 86% of CSF specimens (some specimens were coinfected). HHV-6 primary infection causes roseola in approximately one-quarter of children. Less common but more severe forms of primary HHV-6 infection may include fever of >40°C, respiratory tract distress, tympanic inflammation, diarrhea, and convulsions. Antiviral susceptibility is evaluated by measuring the inhibition of viral replication by immunofluorescence, by antigen slot blots, and by inhibition of virus-induced cytotoxicity.

Citation: Pellett P, Tipples G. 2011. Human Herpesviruses 6, 7, and 8, p 1585-1599. In Versalovic J, Carroll K, Funke G, Jorgensen J, Landry M, Warnock D (ed), Manual of Clinical Microbiology, 10th Edition. ASM Press, Washington, DC. doi: 10.1128/9781555816728.ch100

Key Concept Ranking

Reverse Transcriptase PCR: 0.6113116
Highly Active Antiretroviral Therapy: 0.43428648
Quantitative PCR: 0.43404776
Human herpesvirus 7: 0.421875

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Human Herpesviruses 6, 7, and 8

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FIGURE 1

Child with roseola during primary HHV-6B infection. Photo courtesy of Stephen Dewhurst, University of Rochester. Previously published in reference 44 .

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FIGURE 1

Child with roseola during primary HHV-6B infection. Photo courtesy of Stephen Dewhurst, University of Rochester. Previously published in reference 44 .

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Tables

Human Herpesviruses 6, 7, and 8

/content/10.1128/9781555816728.chap100.tab100-1

TABLE 1

Disease associations

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10.1128/9781555816728/tab100-1.gif

TABLE 1

Disease associations

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TABLE 2

Commercial sources of reagents and assays a

a DNA, purified DNA; qDNA, DNA for use as quantitative reference; qPCR, kit for quantitative PCR. No FDA-approved tests are available for any of these viruses.

10.1128/9781555816728/tab100-2_thmb.gif

10.1128/9781555816728/tab100-2.gif

TABLE 2

Commercial sources of reagents and assays a

a DNA, purified DNA; qDNA, DNA for use as quantitative reference; qPCR, kit for quantitative PCR. No FDA-approved tests are available for any of these viruses.

/content/10.1128/9781555816728.chap100.tab100-3

TABLE 3

Some commercial sources for HHV-6, HHV-7, and HHV-8 testing

a Q, quantitative PCR; q, qualitative PCR.

10.1128/9781555816728/tab100-3_thmb.gif

10.1128/9781555816728/tab100-3.gif

TABLE 3

Some commercial sources for HHV-6, HHV-7, and HHV-8 testing

a Q, quantitative PCR; q, qualitative PCR.

/content/10.1128/9781555816728.chap100.tab100-4

TABLE 4

Diagnostic methods for HHV-6, -7, and -8 a

a ACIF, anticomplement immunofluorescence; NT, neutralization test; RT-PCR, reverse transcriptase PCR. No FDA-approved tests are available for these viruses.

10.1128/9781555816728/tab100-4_thmb.gif

10.1128/9781555816728/tab100-4.gif

TABLE 4

Diagnostic methods for HHV-6, -7, and -8 a

a ACIF, anticomplement immunofluorescence; NT, neutralization test; RT-PCR, reverse transcriptase PCR. No FDA-approved tests are available for these viruses.