（三）患儿的年龄新生儿感染性肺炎：产前和产时感染性肺炎病原菌常见有肠科杆菌（包括大肠杆菌和克雷伯杆菌）、B族链球菌（GBS）和李斯特菌；巨细胞病毒、风疹病毒、梅毒螺旋体、沙眼衣原体、弓形虫等也可以引起产前和产时感染性肺炎，但临床表现较晚。
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