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• W2009542796 abstract "<h3>Background:</h3> <i>Helicobacter pylori</i> remains a global health hazard, and vaccination would be ideal for its control. Natural infection appears not to induce protective immunity. Thus, the feasibility of a vaccine for humans is doubtful. <h3>Methods:</h3> In two prospective, randomised, double-blind, controlled studies (Paul Ehrlich Institute application nos 0802/02 and 1097/01), live vaccines against <i>H pylori</i> were tested in human volunteers seronegative for, and without evidence of, active <i>H pylori</i> infection. Volunteers (n = 58) were immunised orally with <i>Salmonella enterica</i> serovar Typhi Ty21a expressing <i>H pylori</i> urease or HP0231, or solely with Ty21a, and then challenged with 2×10⁵ cagPAI⁻<i>H pylori.</i> Adverse events, infection, humoral, cellular and mucosal immune response were monitored. Gastric biopsies were taken before and after vaccination, and postchallenge. Infection was terminated with antibiotics. <h3>Results:</h3> Vaccines were well tolerated. Challenge infection induced transient, mild to moderate dyspeptic symptoms, and histological and transcriptional changes in the mucosa known from chronic infection. Vaccines did not show satisfactory protection. However, 13 of 58 volunteers, 8 vaccinees and 5 controls, became breath test negative and either cleared <i>H pylori</i> (5/13) completely or reduced the <i>H pylori</i> burden (8/13). <i>H pylori</i>-specific T helper cells were detected in 9 of these 13 (69%), but only in 6 of 45 (13%) breath test-positive volunteers (p = 0.0002; Fisher exact test). T cells were either vaccine induced or pre-existing, depending on the volunteer. <h3>Conclusion:</h3> Challenge infection offers a controlled model for vaccine testing. Importantly, it revealed evidence for T cell-mediated immunity against <i>H pylori</i> infection in humans." @default.
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• W2009542796 date "2008-04-16" @default.
• W2009542796 modified "2023-10-14" @default.
• W2009542796 title "Correlation of T cell response and bacterial clearance in human volunteers challenged with Helicobacter pylori revealed by randomised controlled vaccination with Ty21a-based Salmonella vaccines" @default.
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• W2009542796 doi "https://doi.org/10.1136/gut.2007.145839" @default.
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