Host innate immune response to Mycobacterium tuberculosis.

This review focuses on recent progress in our understanding of Mycobacterium tuberculosis survival in macrophages, the interaction of M. tuberculosis with Toll-like receptors (TLRs) and the establishment of the link between innate and adaptive immunity, and TLRs and interferon-gamma-mediated antimicrobial pathways in macrophages. We also propose a paradigm that TLR2 signaling regulates the magnitude of the host Th1 response leading to either M. tuberculosis persistence and latent infection or replication and disease.