It is not possible to give an accurate time of conversion for asymptomatic infected patients, and patients are advised to actively cooperate with isolation treatment and need to undergo regular pathogenic testing during isolation to determine if conversion occurs. Asymptomatic infected patients are usually those who are asymptomatic for novel coronary pneumonia. Such patients are positive by nucleic acid test but do not show symptoms related to fever, cough, sore throat, muscle aches, etc., and some patients still have no obvious symptoms after 14 days of incubation period observation. Patients with asymptomatic infection may have a better constitution and stronger resistance to the virus, or they may be infected with a smaller number of viruses, and the time to turn negative may be faster than those who develop the disease. Other patients who do not show significant symptoms at the time of nucleic acid testing and develop symptoms during subsequent isolation treatment will have a delayed time to conversion. After a negative nucleic acid test, patients should still actively wear a mask, be protected by disinfection, and avoid travel to areas at high risk of infection. Exercise such as jogging, badminton and rope skipping may also enhance physical fitness and increase resistance to viral infections.