It will not end until the epidemic situation in Changchun is relaxed.

This round of epidemic in Changchun began to be reported in the middle and late February 2022, and the first confirmed case was found among the active medical staff, and the source has not been ascertained until now.

The reasons for the serious epidemic situation in Changchun are: firstly, the best epidemic prevention opportunity was missed; secondly, the Omicron virus was cunning; and thirdly, there were more population movements. Omicron BA.2 mutant is not easy to find, and the symptoms after infection are also very mild. Once it spreads, it is difficult to find out the source, and there will be multiple transmission chains caused by negative-turned infected people, which will delay the epidemic prevention opportunity.