Chengyang district, Qingdao. From : to 24: on December 8, 222, there were 37 new cases of asymptomatic infection in Qingdao, including 28 cases in Chengyang District, 3 cases in Licang District, 3 cases in Jimo District, 2 cases in pingdu city and 1 case in jiaozhou city. Among them, 2 cases were detected in centralized isolation points, 11 cases were detected in home isolation medical observation, 3 cases were detected in key personnel screening and 3 cases were detected in community screening. Among them, there are 8 cases of green-returning personnel.