miR-155 and the miR-183/96/182 cluster modulate P. aeruginosa keratitis by regulating the function of macrophages (Mϕ). A. miR-155 targets the expression of Rheb, which enhances the production of iNOS and mTOR activity to promote phagocytosis and intracellular bacterial killing. B. miR-183/96/182 targets Nox2, important in ROS and RNS production, to promote phagocytosis/intracellular bacterial killing, and DAP12, which limits production of pro-inflammatory cytokines.