Positive viral nucleic acid test indicates infection, among which COVID-19 nucleic acid test mainly detects whether there is COVID-19 nucleic acid in nasopharyngeal swab, throat swab, sputum and other samples, and positive test results indicate COVID-19 infection. From a professional point of view, screening COVID-19 infected people through nucleic acid detection is considered to be the most important means and measures to achieve "early detection" and "early diagnosis".
The quantitative detection of HIV nucleic acid is usually called viral load detection, which can show the virus level in infected people. It can be used to monitor the therapeutic effect of antiviral drugs and monitor the progress of diseases. Regular detection of HIV load is helpful to monitor the course changes of infected people and patients, and provide virological basis for antiviral drug treatment combined with CD4+T lymphocyte count. Similar to qualitative detection, for individuals who have negative HIV antibody screening and have a recent epidemiological history or uncertain diagnosis results, combined with epidemiology, clinical history and CD4+T lymphocyte count, when the quantitative detection of nucleic acid reaches the set criteria, it can also be used as a basis for diagnosing HIV infection.