The document lists the most common pathogens that cause pneumonia which include Streptococcus pneumoniae, Chlamydia pneumoniae, and Mycoplasma pneumoniae. It also identifies the major causes of hospitalizations for pneumonia as Streptococcus pneumoniae, Haemophilus influenzae, and Staphycoccus aureus. The pathogens that most commonly cause pneumonia in different age groups are listed, such as Group B Streptococcus, E. coli, and Streptococcus pneumoniae in neonates and infants younger than 3 months.

1. Most common pathogens:
 Streptococcus pneumoniae
 Chlamydia pneumoniae
 Mycoplasma pneumoniae
Major causes of hospitalizations:
 Streptococcus pneumoniae
 Haemophilus influenzae
 Staphycoccus aureus
Neonates:
 Group B, E.coli,Strep pneumonia, H.influenzae
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 Respiratory syncytial virus, Strep pneumonial, Influenzae virus
AGE GROUP ETIOLOGY
1. Neonates Group B Strepcoccus
E. Coli
L. Monocytogenes
2. Infants younger than 3 mos Group B Strepcoccus
Chlamydia Trachomatis
3. Older infants, pre schoolers, younger than 5 years old Strep.pneumoniae
H.Influenzae
4.Older than 5 years old S.Pneumoniae
5. 5-10 years old Mycoplasma Pneumoniae
C. Pneumoniae
M. Pneumonaie

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