The critical period of COVID-19 is 1- 14 days, usually 3-7 days, which is contagious in the replacement period. If you come to high-risk areas or come into contact with local people, come into contact with COVID-19 virus-infected people, have a positive nucleotide conclusion, or have symptoms of COVID-19 infection such as fever, drowsiness and dry cough during the replacement period, you need to conduct nucleic acid testing again within 24 hours and cooperate with each other.
At the same time, in some high-risk areas with serious epidemic situation, the validity period of the report conclusion of nucleic acid testing is likely to be 48 hours or 72 hours. Influenza patients in COVID-19 are suspected to be re-examined within 24 hours, so the validity period of different types of phenomenon nucleic acid detection conclusions is different, and the specific time should be determined according to the current local policies.
What's on the swab for nucleic acid testing? When we do nucleic acid detection, we always use the sampling method of oropharyngeal swab. We use a long cotton swab to penetrate into the patient's mouth, scrape the soft end of the cotton swab at the throat and put it into the collection tube, break the rocker outside the collection tube, and then seal the collection tube to obtain the sample.
The medical long cotton swab used for sampling in our inspection is also called throat swab, which is different from ordinary cotton swab. The test sample is used in the medical device industry, such as collecting liquid microbial strains, DNA, viruses and bacteria in the mouth, nose, throat and uterus of the body.
The cotton swabs needed for nucleic acid detection are generally disposable flocking cotton swabs. The application of this soft brush in the sampling process will not make users feel uncomfortable. At the same time, the flocking cotton swabs used in different positions adopt different breaking points, and the thickness of the rods is different, and the softness is also different. For example, the nasal swab is more accurate and softer above the stem, and the breaking point is longer, which basically caters to the design of bodybuilding engineering.