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Background An effective tuberculosis (TB) vaccine is urgently needed to support the End TB Strategy to reduce the number of new TB cases by 80% by 2030. M72/AS01E candidate vaccine is an adjuvanted recombinant fusion protein derived from Mycobacterium tuberculosis Mtb32A and Mtb39A proteins. Methods We conducted a randomized, double-blind, placebo-controlled phase 2b trial (NCT01755598) in Southern and Eastern Africa to assess M72/AS01E’s efficacy against bacteriologically confirmed pulmonary TB disease in HIV-seronegative (HIV–) adults aged 18–50 years infected with Mtb (defined by a positive IFN-γ release assay). Participants were randomized 1:1 to receive M72/AS01E or placebo at day D0 and D30. Reactogenicity, safety, immunogenicity were assessed, and incident TB disease measured from D30 postdose 2 up to ≥24 months for this analysis (follow-up ongoing up to 37 months). Efficacy against various TB disease case definitions (Figure 1) was estimated. Primary objective: efficacy against culture- or PCR-confirmed pulmonary TB disease in HIV– adults (case definition 1; success criterion: lower limit of 90% 2-sided CI >0%, power: 80%). Results Demographic characteristics were similar between M72/AS01E (1786) and placebo (1787) recipients. Efficacy against pulmonary TB disease case definition 1 was 54.0% (90% CI: 13.9, 75.4; P = 0.042); efficacy against other case definitions and a sensitivity analysis are shown in Figure 1. Leading solicited symptoms were pain, fatigue, and headache (Figure 2). In all recipients, unsolicited symptoms (D0–29) were more frequent after M72/AS01E (67.4%) than placebo (45.4%), mainly attributable to increased injection site reactions and flu-like symptoms. Serious adverse events (D0–month 7) incidences were similar between groups (M72/AS01E: 1.6%; placebo: 1.8%). During the study, 24 adults died (14 due to traumatic events); all deaths were unrelated to the trial. Conclusion M72/AS01E presents a clinically acceptable safety profile and significantly reduces bacteriologically confirmed pulmonary TB disease incidence in HIV– adults with latent Mtb infection. Funding. BMGF; Aeras; DFID UK; DGIS; AusAID; GlaxoSmithKline Biologicals SA. Disclosures O. Van Der Meeren, GSK: Employee and Shareholder, Salary. M. Hatherill, Aeras: Investigator, Research grant. R. J. Wilkinson, GSK: Grant Investigator, indirect funding. H. M. Ayles, GSK: Grant Investigator, Research grant. G. Henostroza, Aeras: Investigator, Grant recipient. M. A. Demoitié, GSK: owns stocks and is named inventor on patent applications relating to certain uses of M72/AS01E, Salary. T. Singh, GSK: Employee and Shareholder, Salary. E. J. Akite, GSK: Employee, Salary. A. K. Azam, GSK: Employee, Salary. A. Bollaerts, GSK: Employee, Salary. A. M. Ginsberg, GSK: Collaborator, Research support. BMGF: Grant Investigator, Grant recipient. UK DFID: Grant Investigator, Grant recipient. P. Gillard, GSK: Employee and Shareholder, Salary and stock. D. R. Tait, Aeras: Employee, Salary. GSK: Shareholder, Salary.

open forum infectious diseases

120. A Randomized Double-blind Trial Assessing the Efficacy of M72/AS01E Vaccine Against Pulmonary Tuberculosis Disease in Adults With Latent Mycobacterium tuberculosis Infection