Methods Sera samples were collected from SARS cases in the 5~(th),20~(th) and 35~(th) month after onset of the illness.

• 方法对SARS康复病例进行随访,分别采集病后第5个月、第20个月和第35个月的血清,每份血清标本均采用间接酶联免疫吸附试验(ELISA)和微量中和试验二种方法进行血清SARS-CoV特异性抗体的检测。