<prompt> Most effective bacterial system within phagocytes is-Lysozyme mediatedLactoferrin mediatedReactive oxygen metabolite mediatedCationic basic protein mediated  <response>: Ans. is c i.e. Reactive oxygen metabolite mediatedMicrobial killing bactericidal activity is largely mediated by oxygen dependent mechanisms. The most effective efficient bactericidal system within phagocytes is the oxygen dependent H202-MPO-Halide system that mediates bacterial killing by the generation of HOCI with the help of myeloperoxidase and H202. 