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下呼吸道感染病原体多种多样．随着血清学和聚合酶链反应（ＰＣＲ）检测方法的进展，非典型病原体和肺炎支原体（Ｍ．ｐｎ）、肺炎衣原体（Ｃ．ｐｎ）和军团杆菌所致下呼吸道感染的报道日益增多，越来越引起人们的关注。１９９５年２月～１９９５年７月我们对６１例慢性支气管?
Lower respiratory tract infections a wide variety of pathogens. With the development of serological and polymerase chain reaction (PCR) detection methods, reports of atypical pathogens and lower respiratory tract infections caused by M.pn, C.pn and Legionella are increasing The more people are attracted attention. February 1995 ~ July 1995, we have 61 cases of chronic bronchitis?