Nucleic acid detection is generally used to detect whether COVID-19 is infected, and a nucleic acid detection can generally last for one week. Because the incubation period of COVID-19 is mostly 3-7 days, the frequency of 7 days is convenient for observation and timely detection of infection. However, the effective time of nucleic acid detection is also related to factors such as whether COVID-19 is infected, whether there is a history of contact with COVID-19 patients, and whether it is in high, medium and low risk areas.

1, COVID-19-infected people: If they are infected with COVID-19, they usually have a nucleic acid test every 24 hours. At this time, we should actively cooperate with isolation treatment until the condition improves and the nucleic acid test is negative;

2. Suspected COVID-19-infected person: If it is suspected COVID-19-infected person who has a history of contact with COVID-19, it usually needs to be quarantined for 14 days. During this period, nucleic acid testing should be conducted every 24 hours. If the result is positive, treatment measures should be taken immediately. If it is negative, it should cooperate with continuous nucleic acid detection until the end of isolation;

3. People in high, medium and low risk areas: This situation needs to be decided according to local policies. In general, people in high-risk areas do nucleic acid testing every two days until the high-risk signals in this area are lifted. The middle-risk area needs to be isolated for 14 days, during which three nucleic acid tests are carried out, and the population in the low-risk area needs to be isolated for 14 days, during which 1 nucleic acid tests are carried out.