After the human body has been infected with Omicron, the body’s immune cells will produce specific antibodies, but this does not mean that it will not be infected twice. Omicron is a new, more contagious, mutated strain that is spread by droplet and contact. The body produces new antibodies within 5 days after infection with omicron, which have a protective effect in the body and persist in the infected person, killing the virus and causing the level to decrease until it turns negative. Antibodies do not disappear after conversion. If the body is invaded by Omicron again, the antibodies in the body will kill the Omicron virus and reduce the possibility of being infected with Omicron again, but some people with poor immunity will be infected twice. Patients who have antibodies after conversion still need to wear masks and take precautions, and if they have not been vaccinated, they need to catch up on their vaccinations.