The time it takes for a positive nucleic acid test for the new coronavirus to turn negative is related to the individual’s physical condition, the strain of the new coronavirus that infected him or her, and the severity of his or her illness. For example, asymptomatic infected patients infected with the omicron strain or mildly ill patients usually turn negative in about 7 days, while the time to turn negative is prolonged in critically ill patients. Some infected patients with no obvious symptoms or mild symptoms after infection with the new coronavirus, only fever, cough and other symptoms, can be symptomatic treatment, at this time, usually 7 days to turn negative. However, some patients are in serious condition and may have symptoms such as respiratory distress or even acute respiratory distress syndrome, etc. They need to be transferred to a designated hospital for treatment in a timely manner, at which time the time for patients to turn negative will be prolonged.