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Entry 2020.12.14 08:39
Nasopharyngeal smear mobilization PCR, saliva test PCR, rapid antigen test method
With more than 1,000 new confirmed cases of coronavirus infection in Korea every day, and it is rapidly spreading across the metropolitan area, a large-scale preventive diagnostic test will begin at the temporary screening clinic in the metropolitan area from the 14th.
According to the Central Defense Countermeasures Headquarters (Bang Dae-bon), the government establishes three weeks from this day to the 3rd of the following month as an “ intensive inspection period ” and conducts free inspections through screening clinics. temporary installed in 150 locations in the metropolitan area. Since the goal is to find “ asymptomatic patients ” early by lowering the corona test barrier, temporary screening clinics are located in areas with good access, and “ anonymous tests ” that do not collect are possible. information other than mobile phone numbers.
In Seoul, it is known to include the main university districts, Seoul Station, Yongsan Station, and Tapgol Park in Jongno-gu. In the case of Goyang City, three transportation hub areas, including Hwajeong Station, Jeongbalsan Station, and Ilsan Station Exit on the Gyeongui Line, were added as temporary detection stations.
The temporary clinic is open from 9 am to 6 pm on weekdays and weekends. 810 people are also employed to support epidemiological investigations, including military, police and probation officers. In addition to the conventional PCR test method (Nasopharyngeal smear gene amplification test method), two new test methods, such as saliva test, PCR and rapid antigen test, were introduced to increase the convenience of testing. proof.
Citizens undergoing the COVID-19 test can choose any of the three test methods, but quarantine authorities recommend that they be performed in the order of nasopharyngeal swabs PCR → saliva PCR → rapid antigen in consideration of accuracy . In particular, if you have any symptoms or if the confirmed person and the flow line overlap, it is better to be tested using the nasopharyngeal swab PCR method.
If two or more characteristic Corona 19 genes in the sample collected by placing a cotton swab deep into the nose are positive, this is considered a confirmation. It is the most accurate among the three test methods and is also used as a worldwide standard test method. It takes approximately 24 hours for the test results to appear.
The saliva sample PCR is the same as the conventional PCR test, but the sample is obtained with a needle instead of placing a cotton swab in the nose. Since the patient spits saliva directly into a separate sample collection container, it is easy to collect the sample and the risk of infection due to the spread of saliva droplets is low.
In the temporary screening clinic, the nasopharyngeal smear PCR test is basically used, but the applicant can perform the saliva PCR test instead. However, the sensitivity is slightly lower than when using a nasopharyngeal sample, up to a level of 92%, so it is recommended to perform it in a lower order than a general PCR test.
The rapid antigen test is a test method that checks for the presence of coronavirus components by collecting a sample from inside the nose. If the PCR test method pretests the virus itself, the rapid antigen test is to detect antibodies generated by the body’s immune response when the corona virus enters the body. If an antigen is detected in a sample, it can be assumed to be positive, that is, an infected state.
The advantage is that you can verify the results immediately after waiting 30 minutes to 2 hours on the site after the inspection.
However, since the precision is somewhat lower than that of the PCR test, if the rapid antigen test result is positive, you must perform an additional PCR test to check for infection.
