Medical Nasopharyngeal & Oropharyngeal Swab Test Collection Training Model for COVID-19 Doctor-Patient Communication

PCR would be chosen where there is a low likelihood of having the virus, but doctors want to be certain the patient doesn't have it. Antigen would be chosen if there is a high probability the patient has the virus (i.e. is experiencing symptoms), and doctors need to screen the patient as positive or negative.

The first type of PCR detection process includes multiple steps such as specimen processing, nucleic acid extraction, and PCR detection. The average detection time takes 2-3 hours. Because it directly detects the viral nucleic acid in the samples we collect, it has strong specificity and relatively high sensitivity and is currently the main detection method. The second type of antibody detection includes the colloidal gold method and the magnetic particle chemiluminescence method. The average detection time of the colloidal gold method is about 15 minutes, but if the serum is used instead of whole blood, the serum processing will take some time. Blood is about 15 minutes. The magnetic particle chemiluminescence method generally takes 30-60 minutes. Antibody detection is to detect the level of antibodies in human blood. In the early stage of infection, the human body may not produce antibodies, so it has a window period for detection. Therefore, antibody detection can be used to assist in the diagnosis of cases with negative nucleic acid tests, and can also be used for screening and screening, but it cannot replace nucleic acid detection methods.