macrophages engulfing bacteria,

phagocytosis immunology inflammation antigenpresentation cytokines activation phagosome antimicrobial immunoregulation intracellular immune cells adaptiveimmunity innateimmunity defense recognition phagocytic activity cellular system host response modulation clearance surveillance function polarization interaction phenotype effector resistance mediators engulfment immunological memory inflammatory immunomodulatory efficiency elimination homeostasis antigenprocessing tolllikereceptors chemokines monocytes macrophage microbe