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McShane, Helen; Pathan, Ansar A; Sander, Clare R; Keating, Sheila M; Gilbert, Sarah C; Huygen, Kris; Fletcher, Helen A; Hill, Adrian V S
Nature medicine, 11/2004, Volume: 10, Issue: 11Journal Article
Protective immunity against Mycobacterium tuberculosis depends on the generation of a TH1-type cellular immune response, characterized by the secretion of interferon-γ (IFN-γ) from antigen-specific T cells. The induction of potent cellular immune responses by vaccination in humans has proven difficult. Recombinant viral vectors, especially poxviruses and adenoviruses, are particularly effective at boosting previously primed CD4+ and CD8+ T-cell responses against a number of intracellular pathogens in animal studies. In the first phase 1 study of any candidate subunit vaccine against tuberculosis, recombinant modified vaccinia virus Ankara (MVA) expressing antigen 85A (MVA85A) was found to induce high levels of antigen-specific IFN-γ-secreting T cells when used alone in bacille Calmette-Guérin (BCG)-naive healthy volunteers. In volunteers who had been vaccinated 0.5-38 years previously with BCG, substantially higher levels of antigen-specific IFN-γ-secreting T cells were induced, and at 24 weeks after vaccination these levels were 5-30 times greater than in vaccinees administered a single BCG vaccination. Boosting vaccinations with MVA85A could offer a practical and efficient strategy for enhancing and prolonging antimycobacterial immunity in tuberculosis-endemic areas.
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