Affected by the COVID-19 epidemic, many patients recovered, which inevitably made many people panic. They felt that although they were cured, it was easy to cause symptoms of recovery. But in fact, the probability of recurrence in COVID-19 is not great, and the recurrence rate is usually between 5%- 10%. Therefore, although COVID-19 is contagious, the symptoms are not serious after recurrence. In the case of COVID-19, only normal treatment and isolation are needed to achieve good control.

COVID-19 just infected novel coronavirus, and this virus can stimulate the immune system and produce antibodies. After being cured, the antibodies of this virus remain in the body, and then they become resistant to this COVID-19. So under normal circumstances, the probability of recurrence is not great, but if the patient's own resistance is low, then after the cure, with the continuous extension of time, the antibody in the body will gradually decrease, which will undoubtedly increase the probability of novel coronavirus infection. After contact with COVID-19's cases, it is easy to have a positive probability again, but if the self-resistance is very good, then this probability will continue to decrease, and the probability of being positive again is usually around 5%.

Generally speaking, COVID-19's positive phenomenon is caused by not keeping a certain distance or nonstandard sampling procedure when doing nucleic acid detection, because the usual detection method is to detect throat specimens, and COVID-19 is also concentrated in the lungs. This collection method can easily lead to the failure to find the virus in time, but if it is detected again in the later stage, it will be judged as positive again. But in fact, the virus detected by such patients is not necessarily an active virus, so such people need not worry.

In addition, some people who are critically ill and have low immunity will also cause the virus to remain in the body for a long time, and even some recessive viruses can't be completely eliminated, which may lead to the fact that the detoxification amount of the body can't meet the requirements of positive testing, and then it can't be judged in time when doing nucleic acid testing, and it will reappear in the subsequent testing process, so it will also be positive again. In a word, the probability of Fuyang in COVID-19 is between 5%- 15%, which is relatively low. Doing a good job in daily epidemic prevention can effectively avoid the possibility of recurrence. Proper exercise at ordinary times, ensuring a balanced diet and eating less irritating, cold and spicy food can also reduce the probability of recurrence of yang in patients.