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1994年4～5月间抽样调查了沧州市城乡O～12a小儿反复呼吸道感染（简称复感）的患病情况，并对其预防措施进行了临床研究，现将结果报告如下。一、复感流调与结果五．诊断标准：全部病例均以1997年成都全国儿科呼吸学术会议制订的反复呼吸道感染诊断标准［1］为诊断依据。上抽样
From April to May 1994, the prevalence of recurrent respiratory tract infections in children and adolescents with O ~ 12a in urban and rural areas in Cangzhou City was investigated by sampling, and the preventive measures were studied clinically. The results are reported as follows. First, complex sense flow and the results of five. Diagnostic criteria: All cases were diagnosed based on the diagnostic criteria of recurrent respiratory tract infection [1] developed by the National Pediatric Respiratory Academic Conference in 1997. Sampling