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Pneumonia is a common infection of the ( lungs, Heart, Brain, Stomach ) that can be life threatening. Pneumonia can be caused by infection with many different bacteria, such as: Klebsiella ( pneumoniae, meningitidis, aureus ), Neisseria ( pneumoniae, meningitidis, aureus ) and Staphylococcus ( aureus, meningitidis, pneumoniae ).