COVID-19's incubation period is uncertain. Academician Zhong Nanshan published a paper a few days ago saying that its incubation period is 1 to 24 days, which means that some people get sick after one day of infection, and some people get symptoms after 24 days of infection. This time has been very long. A patient was reported in Rizhao, Shandong Province, who had contact with the confirmed patient, quarantined for 14 days, and then sent home. Onset occurred on the first day of isolation at home 10, and the incubation period of this person was 24 days. This shows that the virus is too rogue, too deep to be touched.
Because COVID-19 is a new virus, the previous virus detection methods are ineffective. At present, all kinds of bookkeeping tests and pcr tests are newly invented detection methods, which were invented only after the emergence of this virus, so the accuracy of this detection method is limited, and the positive rate may only be 40% to 50%. Because it is pneumonia, there should be inflammation in the lungs, but the literature published some time ago tells us that the early patients were sick and the nucleic acid test was positive, but 20% of the patients who had CT examination did not have pneumonia, and even 5% of the patients who had been rescued in icu did not realize the symptoms of pneumonia. Therefore, the standard for judging the recovery of clinical patients now is that they have no clinical symptoms, no fever or cough for 3 days, feel healthy, and can be discharged after two consecutive negative nucleic acid tests. But we know that the positive rate of nucleic acid detection is relatively low, and sometimes it is not allowed. If this person still carries the virus, but it is not detected and discharged from the hospital, and the virus is contagious, it will still be transmitted to others, then I don't know when the epidemic can be controlled. Therefore, these patients have recovered from treatment without symptoms, and their nucleic acid tests are normal. When they go home, they will have to be isolated from their homes 14 days, so that they will be safe and will not infect others. This is also a way to be responsible for yourself and others. "