202 1 when did the Jilin epidemic begin? According to relevant data, the 20021Jilin epidemic began on February 28th, and the current epidemic in Jilin Province first appeared in Hunchun City, Yanbian Prefecture on February 28th, and then broke out in Jilin City, Changchun City and other places. On February 28th, a positive case appeared for the first time in Hunchun City, Yanbian Prefecture. According to experts' judgment, the local epidemic source is Omicron strain.