“呼吸道易感儿”,是指在不同年龄时期存在的一部分对一般急性呼吸道感染具有明显易感性的儿童。目前认为,这一部分小儿患病率高的主要原因与机体的免疫反应低下有关。为了增强这部分易感小儿抵抗上呼吸道感染的能力,我们对部分集体和散居的儿童,进行了系统的调查及植物血凝素(简称PHA)皮试为主的细胞免疫功能测定,并对部份易感儿分别用左旋咪唑、健脾粉、转移因子作为增强细胞免疫力的措施,与对照组及健康儿做对照观察,获得一定的疗效。现将调查结果初步报道如下: “Respiratory sensitizer” refers to children who are clearly susceptible to a common acute respiratory infection at some age. Currently, the main reason for the high prevalence in children in this area is related to the low immune response in the body. In order to enhance the ability of this part of susceptible children to resist upper respiratory tract infections, we conducted a systematic investigation of some collective and diaspore children and determined the cellular immune function mainly based on the skin lectin (PHA) test. Susceptible children were levamisole, spleen powder, transfer factor as a measure to enhance cellular immunity, and control group and healthy children do comparative observation, access to a certain effect. The preliminary findings of the survey are as follows: