年龄、季节和临床表现是有助于肺炎病原体鉴定的三个因素,急性或慢性发病过程是病原体鉴定的关键因素。 在2～3月龄的婴儿肺炎中,B群链球菌是主要的病原体。婴儿通常急性起病,X线胸片示播散性或局灶性表现。而慢性病程的婴儿肺炎通常由呼吸道病毒、百日咳杆菌、巨 Age, season and clinical manifestations are the three factors that contribute to the identification of pneumococcal pathogens. Acute or chronic pathogenesis is a key factor in pathogen identification. Group B Streptococcus is the major causative agent of pneumonia in infants aged 2 to 3 months. Infants usually acute onset, X-ray showed disseminated or focal manifestations. The chronic disease of infantile pneumonia is usually caused by respiratory viruses, Bordetella pertussis, giant