Streptococcus pneumoniae and Klebsiella pneumoniae are classic causes of bacterial lobar pneumonia, presenting as dense, homogenous consolidation of an entire lobe. Legionella pneumophila can also cause lobar or multilobar consolidation. Mycoplasma pneumoniae, however, is an atypical pneumonia and typically causes a more patchy, interstitial, or bronchopneumonia pattern, rather than a dense, homogenous lobar consolidation.
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