A nucleic acid CT value of 38 or less is not necessarily a new crown; a nucleic acid CT value of 35 or less is a new crown. If the nucleic acid CT value is <35, it is positive for new crown pneumonia. At this time, the contagiousness is still high, and it is necessary to continue hospitalization and isolation treatment; if the value is 35-38, it is negative for C.neoformans, and if two consecutive values are ≥35, then it can be released from isolation or discharged from the hospital under the advice and guidance of the doctor. The CT value, i.e. cycle count threshold, is the basis for determining whether or not a person is infected with neocoronavirus. The nucleic acids of the new coronavirus are replicated by the PCR polymerase chain reaction to reach a detectable amount. the lower the CT value, the lower the number of cycles of the virus, the shorter the cycle time, and the higher the viral load. The "New Coronavirus Pneumonia Diagnosis and Treatment Program (Trial Version 9)" adjusts the criteria for discharge and release from quarantine to two consecutive new coronavirus nucleic acid tests with CT values of the N and ORF genes ≥35 (fluorescent quantitative PCR method, with a sampling interval of at least 24 hours, with a cut-off value of 40). New coronavirus nucleic acid CT value of 38 or less can be regarded as an initial positive screening test, and cannot be used as the basis for confirming the diagnosis of new coronavirus. If two consecutive CT values <35, then the viral load is still relatively high, and should continue to be hospitalized for isolation treatment; if two consecutive values ≥35, it means that the virus could not be isolated from the sample, and the close contacts were not found to be infected, so the isolation can be lifted or discharged from the hospital, and the specific diagnosis and treatment should be in accordance with the doctor's advice. Tip: "New coronavirus pneumonia" and "new coronavirus pneumonia" mentioned in this article were renamed to "new coronavirus infection" on December 26, 2022, as announced by the National Health Commission.