The question of whether it is safe to isolate for 14 days without symptoms should be put this way, if the safety factor is greatly improved after 14 days of isolation. The incubation period of the new coronavirus infection is relatively long compared to other previous viruses, because the incubation period of general influenza or common cold is within 3-7 days, but the new coronavirus from the clinical point of view, its incubation period to be longer. I have seen reports of more than 20 days or even 30 days, but most of the basic illnesses occur within 14 days, so the current policy is still to adopt a centralized quarantine of 14 days. Later on, it was added that it is recommended to continue home isolation for 14 days after the isolation is lifted. It is based on the finding that there are patients who have been positive for more than 20 days or even 30 days. Therefore, if the patient remains asymptomatic after 14 days of isolation, the probability is that he is already safe, but he still has to be cautious, be more careful and take good precautions to stay in isolation for another 14 days. In that case I think it should be less than 100%, 99% should be safe.