Try to avoid eating 2 hours before nucleic acid detection to avoid vomiting; Do not drink (including drinking water), smoke, drink or chew gum 30 minutes before sampling; During clinical examination, swallowing should be reduced, and throat clearing (such as expectoration and spitting) should not be done. Before collecting nasopharyngeal swab, the examinee should inform the collector whether there is any relevant past medical history or related matters. Testers need to wear masks correctly, take them off before testing, put them on immediately after testing, and prepare spare masks after pollution for easy replacement at any time.

Detection: When collecting oropharyngeal swabs, the examinee leans back and opens his mouth to make an "ah" sound, which helps to expose his throat, but there will be irritating dry cough, nausea, vomiting and other symptoms during the process. The examinee can cooperate with the collector to relax as much as possible and take a deep breath; In the process of collection, there may be an itchy feeling in the nose, which stimulates sneezing. You can immediately use paper towels (prepared in advance) or hands, elbows, covers and barriers.

After testing: Leave the collection site immediately after collection to avoid spitting and vomiting around the collection site. Pay attention to hand hygiene before and after nucleic acid detection, and wipe your hands with hands-free disinfectant or alcohol.