The majority of cases of community acquired pneumomia are due to infection with-
The most common infective agent of community acquired pneumonia is Streptococcus pneumoniae.Most cases are spread by droplet infection.Viral infections are impoant causes of CAP in children. Reference:Davidson's Medicine-22nd edition,page no:682
Legionella pneumophila
Streptococcus pneumoniae
Haemophilus influenzae
Staphylococcus aureus
Respiratory system