The purpose of this Notice of Special Interest (NOSI) is to highlight NIAID’s interest in accepting applications that aim to understand the critical drivers of Tuberculosis (TB) transmission at the individual and population levels in high-burden settings. Applicants are encouraged to develop effective methods to measure rates of TB transmission that rely on an increased understanding of the biomedical basis of transmission and related risk factors and to develop and assess potential interventions, including low-cost and low-tech options, to prevent TB transmission.