The most common causative organism causing lobar pneumonia is
Although Streptococcus pneumoniae is most common, other organisms must also be considered in light of the patient&;s risk factors and severity of illness.(Ref: Harrison's 18/e p2131)
Staphylococcus aureus
Streptococcus pyogenes
Streptococcus pneumonia
Hemophilus influenza
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