Streptococcal pneumoniae presents at

→ Streptococcus pneumoniae is the leading cause of pneumonia, both lobar and bronchopneumonia. → Pneumonia is common at the extreme of ages: Children (especially >5 years of age) Elderly (>60 - 65 years) → Serotypes 6, 14, 18, 19 and 23 are responsible for most cases of pneumonia in children, while serotypes 1, 3, 4, 7, 8 and 12 cause pneumonia in adults.