Chinanews client Beijing February 28 (Zhang Xu) Aiming at the phenomenon that the nucleic acid test of some discharged patients turned positive, Guo Yanhong, the inspector of the National Health and Medical Commission's Medical Affairs and Hospital Administration, said on the 28th that on February 17, the Health and Medical Commission Request, follow-up and health management of discharged patients. During this process, some provinces and cities reported that nucleic acid tests turned positive in discharged patients. We organized experts to conduct research and also strengthened continuous monitoring of these cases. It was found that there was no reinfection in these patients, and some patients turned negative again after testing. The pathogenic mechanism and characteristics of neocoronary pneumonia need to be deepened. 14 days of medical observation should be performed for discharged patients, and follow-up health monitoring and guidance should be strengthened.