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Clinical Microbiology Reviews, Jul 1996, 361-381, Vol 9, No. 3
AM Arvin
Varicella-zoster virus (VZV) is a ubiquitous human alphaherpesvirus that
causes varicella (chicken pox) and herpes zoster (shingles). Varicella is a
common childhood illness, characterized by fever, viremia, and scattered
vesicular lesions of the skin. As is characteristic of the
alphaherpesviruses, VZV establishes latency in cells of the dorsal root
ganglia. Herpes zoster, caused by VZV reactivation, is a localized,
painful, vesicular rash involving one or adjacent dermatomes. The incidence
of herpes zoster increases with age or immunosuppression. The VZV virion
consists of a nucleocapsid surrounding a core that contains the linear,
double-stranded DNA genome; a protein tegument separates the capsid from
the lipid envelope, which incorporates the major viral glycoproteins. VZV
is found in a worldwide geographic distribution but is more prevalent in
temperate climates. Primary VZV infection elicits immunoglobulin G (IgG),
IgM, and IgA antibodies, which bind to many classes of viral proteins.
Virus-specific cellular immunity is critical for controlling viral
replication in healthy and immunocompromised patients with primary or
recurrent VZV infections. Rapid laboratory confirmation of the diagnosis of
varicella or herpes zoster, which can be accomplished by detecting viral
proteins or DNA, is important to determine the need for antiviral therapy.
Acyclovir is licensed for treatment of varicella and herpes zoster, and
acyclovir, valacyclovir, and famciclovir are approved for herpes zoster.
Passive antibody prophylaxis with varicella- zoster immune globulin is
indicated for susceptible high-risk patients exposed to varicella. A live
attenuated varicella vaccine (Oka/Merck strain) is now recommended for
routine childhood immunization.
Copyright © 1996 by the American Society for Microbiology. All rights reserved.
Varicella-zoster virus
Department of Pediatrics, Stanford University School of Medicine, California 94305-5119, USA. MN.AMA@FORSYTHE.STANFORD.EDU
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