The most common causative organism causing lobar pneumonia is
Staphylococcus aureus
Streptococcus pyogenes
Streptococcus pneumonia
Hemophilus influenza
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)
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