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肥达氏反应是诊断伤寒病的主要根据之一.但是,仅仅依据肥达氏反应单项阳性,如“O”和“H”或“甲”和“H”或“甲”和“乙”阳性,就确诊为伤寒病是不妥当的.这里就肥达氏反应的正确实验方法及其在诊断伤寒病时的价值,加以讨论.应用肥达氏反应的原则一、采血时间。应在发烧后第1～4周之间进行.不可过早(抗体尚未产生),也不可过晚(抗体已消失).病后第2周,此反应阳性率可达80%。在第3～4周内,有90%的患者血清凝集效价在1:160以上,以后凝集效价逐渐下降转为阴性。二、要取双份血清,比较凝集价的变化.一次取血在患病高峰期,另一次在恢复期.两次检查间隔时间一般为7～10天。结果与临床诊断的关系一、健康人的血清中有凝集素存在,但效价很低。“O”抗体凝集价必须在1:80以上,“H”
The Widal reaction is one of the main reasons for the diagnosis of typhoid fever, but only on the basis of a single positive Widal reaction such as “O” and “H” or “A” and “H” or “A” and “B” , Diagnosed as typhoid fever is not appropriate here to Watson’s response to the correct experimental method and its value in the diagnosis of typhoid fever, to be discussed.Application of the principle of fat Darth reaction, blood sampling time. Should be carried out in the first 4 weeks after the fever. Not too early (the antibody has not yet produced), nor too late (antibodies have disappeared.) 2 weeks after the disease, the positive rate of this reaction up to 80%. In the first 3 to 4 weeks, 90% of patients with serum agglutination titer in the 1: 160 or more, after gradually decreased agglutination titer turned negative. Second, we should take double serum, comparing changes in agglutination price.A blood at the peak of the illness, the other in the recovery period.The interval between the two inspections is generally 7 to 10 days. Results and clinical diagnosis of a healthy human serum lectin exists, but the price is very low. The “O” antibody agglutination price must be above 1:80, “H”