<prompt> All of the following organisms are known to survive intracellularly except -Neisseria meningitidisSalmonella typhi.Streptococcus pyogenesLegionella pneumophila  <response>: Facultative intracellular organisms Besides obligate intracellular organisms, some other organisms can live intracellularly Facultative intracellular organisms.These bacteria also have the capability of synthesis their own ATP, So they usually live extracellularly in contrast obligate intracellular organisms.These bacteria are phagocytosed by the hosts macrophages and neutrophils yet survived within these WBCs by inhibiting phagosome-lysosome fusion, thus escaping hosts toxic H2O2 and superoxide radicals.Important examples :-Listeria monocytogenes - Yersinia - Brucella - MycobacteriumNeisseria - Salmonella typhi - Legionella - Francisella tularensis 