In part, this is due to the fact that most lobar pneumonias are due to Streptococcus pneumoniae (pneumococcus) and for decades, these have responded well to penicillin therapy so that advanced, severe cases are not seen as frequently.

• 部分原因是,绝大多数大叶性肺炎由链球菌(肺炎球菌)引起，并且数十年来，青霉素治疗对其比较有效，因此复杂、严重的病例不常见。