广东地区严重急性呼吸综合征患者血清学调查

SEROLOGICAL INVESTIGATION ON SARS PATIENTS IN GUANGDONG PROVINCE

目的 通过调查严重急性呼吸综合征(SARS)患者血清中特异IgG、IgM抗体 ,找出冠状病毒与SARS之间可能存在的病因关糸 ;比较急性期和恢复期血清抗体效价 ,寻求该病毒特有的血清学反应及其临床意义。方法 用新分离SARS病毒作为抗原 ,采用间接免疫荧光 (IFA)和酶联免疫吸附试验 (ELISA)法 ,对广州 4所医院SARS病人的血清标本进行检测。结果 检测临床诊断SARS病人13 0例 ,其中 117例出现病毒特异性抗体 ,阳性率达 90 % ,病人血清IgG抗体滴度 10天后明显上升 ,15天后抗体达到高峰 ,IgM抗体滴度2 0～ 3 0天达到高峰。检测 119例健康接触者和同一流行区 10 0例健康人 ,结果全部为阴性。结论 SARS病人血清与新分离SARS病毒抗原有高水平的特异反应 ,证实病人急性感染了这种新的病毒 ;病人恢复期血清IgG抗体在体内滴度高、持续时间长 。

Objective To detect IgG and IgM antibodies in the sera of SARS patients, in order to find the possible causative association between new coronavirus and SARS; to compare IgG and IgM antibody titers of acute phase with those of convalescent phase, in order to find specific serological reaction of SARS virus and its clinical significance. Methods Clinical specimens of SARS patients in 4 hospitals of Guangdong Province were collected and then detected by IFA and ELISA. The specificity and cross-reaction of each specimen for confirming the new coronavirus were evaluated. Results One hundred and seventeen of 130 clinically diagnosed SARS patients showed viral specific serological reaction, with the positive rate of 90%. The IgG titer increased significantly 10 days after the onset of infection and reached a higher level (above 320) 15 days later, while IgG titer reached the highest level on the 20 th-30 th day. The specific antibodies were negative in all 119 individuals with close contact with patients and 100 normal controls. Conclusion Viral specific IgG antibody was detected in the sera of SARS patients, confirming that the patients were infected by the virus; persistent high titer of IgG antibody in the sera of convalescent patients might probably be a protective mechanism in general population.