The vast majority of these are caused by the streptococcus pneumoniae.

其中绝大部分是由肺炎链球菌引起的。

In adults, bacterial causes include streptococcus pneumoniae, haemophilus influenzae, and staphylococcus aureus.

成人细菌性肺炎的病因包括肺炎链球菌、流感嗜血杆菌和金黄色葡萄球菌。