A study by Zaki and Godal reported that Chlamydia
pneumoniae, Mycoplasma pneumoniae, Legionella pneumophila,
Coxiella burnetii, adenovirus, and infuenza virus were the
pathogens responsible for CAP. Streptococcus pneumoniae (22%)
followed by Haemophilus infuenzae (18%). Mycoplasma pneumoniae
(5%) and Legionella pneumophila (5%) were the most common
isolated bacteria. The most common positive serological reaction
was for Chlamydia pneumoniae (30%) and adenovirus (30%).4