New crowns cured for 50 days still have a very low likelihood of repositive positivity and require required nucleic acid testing, health monitoring and other measures. New crown cure 50 days, there is still the possibility of relapse, but the possibility is very low. The so-called new crown cure does not mean that all the new crown virus in the body is killed, but the CT value is greater than or equal to 35 when the nucleic acid test is performed, then the discharge standard is reached, and there is generally no contagious, but there may still be a very small amount of virus remaining in the body. Therefore, theoretically, there is a very low possibility of recurrence of the residual neocoronavirus in the body, and most of the people can fight against the virus through their own immunity to achieve the effect of complete elimination. However, children and the elderly, who have lower immunity, have a very low possibility of relapse, and some regions have already seen cases of relapse. Therefore, it is necessary to follow the relevant requirements for nucleic acid testing, health monitoring, etc., and once symptoms such as fever or a positive nucleic acid test appear, it is necessary to quarantine and treat the disease in a timely manner.