1. What is the current local infection situation? Judging from the published data, the number of people infected with COVID-19 epidemic in Dalian is still rising, mainly because there are more floating population in this area, and the infection is mainly concentrated in some densely populated places that were increased in the previous period. So many people were infected at that time, especially some asymptomatic infected people.
Second, the source has been found. If you want to solve the spread of COVID-19 epidemic, you must find its source, because its cost is the least, and at the same time, it is the fastest to solve. According to the latest news released by Dalian, during the spread of COVID-19, the cases were mainly concentrated in Keqiang Food Company and the nearby university town, and the reason for this situation was that it imported a lot of frozen food.
Third, why did it spread so fast this time? Judging from the current transmission speed, it has actually passed the peak period, and now it has entered a stable period, which is generally controllable. This is a very good signal for Dalian to prevent and control the COVID-19 epidemic. It proves that our efforts have not been in vain in this epidemic prevention and control work. The reason why the spread speed is relatively fast is mainly because this time it belongs to Delta mutant, which is very concealed and can be hidden in people's bodies for a long time without being attacked.