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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Varicella-zoster virus-specific cell-mediated immune responses in HIV-infected adults.
AIDS Research and Human Retroviruses 2011 October
The incidence of herpes zoster remains high in HIV-infected patients despite the use of combined antiretroviral therapy (cART). We wished to assess varicella-zoster virus (VZV)-specific cell-mediated immune (CMI) responses in HIV-infected adults on cART. VZV-specific CMI responses were assessed using lymphocyte proliferative responses, cytokine production (IL-2, TNF-α, and IFN-γ), and interferon-γ ELISPOT assays in 103 HIV-infected adults and 30 healthy controls. HIV-infected patients were analyzed according to their current and nadir CD4 cell count and their use of cART. A multivariate analysis was performed to identify factors associated with VZV-specific CMI responses. HIV-infected patients had lower VZV-specific CMI responses than healthy controls. Patients with a CD4 T cell count <100/μL had almost no detectable responses whereas those with a current CD4 T cell count >300/μL and suppressed viral replication on cART had responses similar to those of healthy controls. In multivariate analysis, factors significantly associated with VZV-specific CMI responses were the absence of a previous AIDS-defining event and higher CD4 cell counts, in particular central and effector memory CD4 T cell counts. HIV-infected patients with a history of AIDS or low CD4 cell counts have impaired VZV-specific CMI responses, and remain at risk for herpes zoster.
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