Swallow swab refers to taking a small amount of secretion from the throat of the examinee temporarily with a sterilized medical long cotton swab, and then testing the virus in the respiratory tract. The detection method is to let the patient open his mouth and make an "ah" sound, fully expose the pharynx, and then wipe the secretions on the pharyngeal arch and tonsils on both sides with a long cotton swab. After collection, quickly put the cotton swab into the test tube with detection and seal it for timely inspection.
Extended data:
At present, most hospitals adopt oropharyngeal swab sampling.
After COVID-19 infects the human body, it will first reproduce in the respiratory system, so we can judge whether the human body is infected with the virus by detecting the virus nucleic acid in sputum and nasopharyngeal swab. After a period of infection, usually 7- 10 days, the human body will produce specific antibodies against the virus. IgM antibody appears first, then IgG antibody appears, so detecting these specific antibodies can judge whether the human body has been infected with the virus.
The difference between throat swab and nucleic acid detection is that there is viral nucleic acid in the specimen, which means that the infected person may be contagious. IgM antibody positive indicates that the patient is in the early stage of infection, and IgG antibody positive indicates that COVID-19 has been infected, but it is uncertain whether it is contagious.
For example, recovered people are generally positive for IgG antibodies. If the nucleic acid test is negative, the nucleic acid is still negative after 24 hours, indicating that it is not contagious. Compared with antibody detection, nucleic acid detection is more sensitive and is also the "gold standard" for laboratory detection. Of course, both antibody detection and nucleic acid detection have a certain proportion of false positives and false positives, so clinicians should make comprehensive judgments based on clinical symptoms and epidemiological investigation results.
Ganlong Com-45 The throat swab of Beijing Xinfadi people is positive, which means the diagnosis is confirmed?
Baidu encyclopedia-throat swab detection