A vaccine designed to reduce the incidence of pulmonary tuberculosis in HIV-negative adults has shown an overall efficacy rate of 50%, according to the developers GlaxoSmithKline Plc and the international AIDS vaccine initiative (IAVI). The Phase 2b study enrolled adults with latent TB infection, which is estimated to affect one-quarter of the global population. Of this number, an estimated 10% will develop active pulmonary TB disease.
