BEIJING - The Chinese mainland reported 13,146 local COVID-19 cases on Sunday, including 1,455 confirmed and 11,691 asymptomatic ones, the highest number of daily increase since the latest outbreak, which has already infected over 100,000 people.  While one of the severest-hit regions in Northeast China’s Jilin Province successfully curbed the epidemic, the infection curve has not seen signs of decline, and a new Omicron variant mutation was detected in East China’s Jiangsu Province, neighboring Shanghai, where the mass majority of cases in China have been found in recent days. Shanghai in particular, reported 438 local confirmed and 7,788 asymptomatic cases on Sunday. Chinese Vice Premier, Sun Chunlan, on Saturday made an official visit to the city to help battle the virus.