TB: screening for responses to a vile visitor.

Mycobacteria, the pathogens that cause tuberculosis and leprosy, establish long-term infections in host macrophages. Recent studies, including two genetic screens reported in this issue of Cell (Kumar et al., 2010; Tobin et al., 2010), reveal that virulent mycobacteria evade the host immune system by stimulating production of anti-inflammatory molecules and inhibiting autophagy. (c) 2010 Elsevier Inc. All rights reserved.