Mixed virus sampling has 5-in-1, 10-in-1, and 20-in-1 sampling methods, and the 20-in-1 mixed sampling is more accurate and can significantly improve detection efficiency. The accuracy of the new crown test is still very high, however, no test can guarantee 100% accuracy, and there may be some errors. False positives or false negatives may occur, so it is usually necessary to do the nucleic acid test at least twice. Nucleic acid tests are done by nasal swab and throat swab, and there may be some discomfort when the sample is collected, but that discomfort can still be tolerated. It is important to note that half an hour before the throat swab do not eat, and need to pay attention to oral hygiene, after the collection of samples, if nausea, vomiting, can be appropriate to drink warm water for relief, and appropriate relaxation can be. A 20-in-one mix is more accurate, and if a positive result occurs, all 20 people in that tube need to be tested individually.