Nucleic acid detection is the most effective and rapid detection method in COVID-19. The speed of nucleic acid detection in China is generally around 12~24 hours, and a few institutions can produce results as soon as 2 hours.
If there is still no result after 24 hours of nucleic acid testing, for a single person, you can consult a nucleic acid testing institution to confirm the problem. For the collective tester, if there is still no clear result within 24~48 hours, it generally means that the nucleic acid test is negative, so don't worry too much. If you need to provide specific nucleic acid test certificates or reports, you can also consult the medical institutions or community neighborhood committees that conduct collective sampling.