Most common causative organism for lobar pneumonia is -

Streptococcus pneumoniae is the Most common causative organism for lobar pneumonia Adult: MC serotype associated: Type 1-8 Children: Type 6, 14, 19, 23 are frequently associated serotypes Most Virulent: Type 3. Ref: Apurba Sastry’s Essentials of Medical Microbiology 1/e p233 , Ananthanarayan 9/e p222