Seven-day three-test nucleic acid detection means that three nucleic acid tests are completed within seven days, which are the first day, the third day and the seventh day respectively, because if it is infected by COVID-19 mutant Omicron, and the average incubation period of Omicron mutant is 3~4 days, but if it is only three days and two tests, COVID-19 will not be detected and there may be missed diagnosis and misdiagnosis, so from the perspective of risk prevention, it will be safer to carry out seven-day three-test.
Seven-day five-test is a test measure taken by the epidemic prevention department during the epidemic period. Nucleic acid was detected five times in seven days, one or two days before, four or five days after and once on the seventh day. If all the tests are negative and the whole area is negative, then it belongs to the low-risk area. Can be unsealed in an orderly manner. During the epidemic, we must try our best to reduce going out and ensure personal safety.
Nucleic acid is an important material basis of life. Detection of pathogen nucleic acid is one of the reliable methods for early diagnosis of modern infectious diseases. At present, it is mainly used for the diagnosis of novel coronavirus, hepatitis B, hepatitis C, AIDS and other diseases, and can also be used to check the drug resistance genes of some pathogens, such as HIV, Helicobacter pylori, Candida, Mycoplasma pneumoniae, Chlamydia pneumoniae and Treponema pallidum.
If the nucleic acid is positive, it means that the nucleic acid of a pathogen exists in the specimen and cannot be immediately diagnosed as the pathogen currently infected. It is necessary to cooperate with other laboratories and imaging examinations to make a definite diagnosis. It is normal to be negative for nucleic acid. It should be noted that due to the different precision of instruments or the influence of different laboratories, the reference values of laboratory sheets issued by different medical institutions in real life may be different, resulting in false negative results.
The reasons of false positive of nucleic acid are: instruments and equipment are not maintained and calibrated in time, the quality of kits and consumables is not up to standard, and the reagent itself is positive. Specimens are improperly collected, transported, received and preserved and are contaminated.
Legal basis:
Article 77 of the Law on the Prevention and Control of Infectious Diseases
Units and individuals that, in violation of the provisions of this law, cause the spread and epidemic of infectious diseases and cause damage to others' lives and property shall bear civil liability according to law.