Varicella zoster virus immunity: A primer.
Varicella zoster (VZV) is among the most prevalent viruses affecting the human race. The majority of us experience primary infection as varicella in childhood and remain latently infected, with occasional reactivation as the infectious entity, shingles. Rarely, VZV causes severe and disseminated disease, which can be fatal despite the availability of highly active antiviral agents. VZV is the only herpesvirus against which effective vaccines have been developed and widely implemented in several countries, further complicating its epidemiology. The immunological correlates of protection against varicella remain incompletely understood. Here we provide a brief overview of evidence from animal models and observational studies that define immunologic risk factors for severe varicella, and thus the most important elements of VZV immunity. Although circulating VZV-specific antibody can prevent primary infection, innate and cellular responses appear much more important in limiting its severity and duration. Improved understanding of these protective factors may assist us in developing more effective strategies for the prevention and treatment of severe varicella.
Primary Immunodeficiency Group, Institute of Cellular Medicine, 4th Floor Catherine Cookson Building, Newcastle University, Medical School, Newcastle Upon Tyne, NE2 4HH, UK; Department of Infection & Tropical Medicine, Royal Victoria Infirmary, Newcastle Upon Tyne, NE1 4LP, UK. Electronic address: Christopher.Duncan@newcastle.ac.uk.
Christopher J A
CJ
Duncan
Primary Immunodeficiency Group, Institute of Cellular Medicine, 4th Floor Catherine Cookson Building, Newcastle University, Medical School, Newcastle Upon Tyne, NE2 4HH, UK; Great North Children's Hospital, Royal Victoria Infirmary, Newcastle Upon Tyne, NE1 4LP, UK. Electronic address: sophie.hambleton@newcastle.ac.uk.
Sophie
S
Hambleton
D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D006566:Herpesviridae Infections / Q000276:immunology*; D014645:Herpesvirus 3, Human / Q000276:immunology*; D006801:Humans; D007372:Interferons / Q000276:immunology
D007372:Interferons
Antibody; CD4+ T cell; Chickenpox; Immunodeficiency; Interferon; NK cell; Shingles; VZV; Zoster