Dandong City, the cumulative report of 116 cases of positive infected persons, social surface screening found 65 cases, isolation control personnel screening found 51 cases. Among them, in foreign provinces and cities to (return) Dandong personnel have found 9 cases, distributed in Zhen'an District, Donggang City, Fengcheng City and Kuandian County, are in the first time after arriving in Dandong to implement health management measures, did not cause the social face of the spread of the local 107 cases, distributed in the revitalization of the district, Yuanbao District, Zhen'an District and Donggang City, Kuandian County.
Liaoning CDC conducted second-generation whole-genome sequencing of the epidemic strain of C. neoformans in Dandong City, and through the analysis of characteristic mutation loci, the local epidemic strain is different from the current epidemic strains all over the country, which belongs to the VOC/Omicron mutant strain (BA.2.3 Evolutionary branching), and it can be divided into six chains of transmission.
Including, "11-19" "11-20" found in the social surface of the positive infected people belong to 2 chains of transmission, is circulating. Dandong City epidemic prevention and control is facing the double pressure of "external defense against importation, internal defense against rebound". Recent outbreaks show continued importation, multiple chains of transmission intertwined situation, the risk of places and risk of personnel, risk of personnel mobility, followed by the possibility of a new source of importation, there is a risk of proliferation of the epidemic, the epidemic situation is still serious and complex. At present, there are still disseminated cases in the social surface of Dandong City. The main city of Dandong has to continue to carry out regional nucleic acid testing, schools, public transportation, dine-in and other places that are prone to large-scale gatherings of people, open conditions are not yet mature. Flow of investigation found that a number of positive infected people infected by participating in square dancing, playing poker, mahjong, potluck, pile chatting and other congregational activities. Therefore, not participating in gathering activities is one of the effective ways to reduce the risk of new coronavirus infection.