1.Epidemiological characteristics of a local cluster epidemic caused by the BA.2 evolutionary branch of Omicron variant
Zhaokai HE ; Zhe WANG ; Qingjun KAO ; Shi CHENG ; Shuang FENG ; Tingting ZHAO ; Yanyang TAO ; Xinfen YU ; Zhou SUN
Chinese Journal of Preventive Medicine 2024;58(1):65-70
Descriptive epidemiological methods were used to analyze the epidemiological characteristics of the local cluster of COVID-19 in the logistic park of Yuhang District in Hangzhou in March 2022. The cluster epidemic was detected by a case who actively visited the fever clinic. The epidemic lasted for 8 days, and a total of 58 cases (53 workers, 2 students, 1 farmer, 1 teacher and 1 unemployed) were found, including 40 males and 18 females. The age was (33.29±12.22) years. There cases were mainly in Yuhang District (48 cases, 82.77%) and Shangcheng District (7 cases, 12.07%) of Hangzhou. The real-time regeneration number peaked at 2.31 on March 10 th and decreased to 0.37 on March 15 th. The sequencing result of the indicated case was 100% homologous with the sequence uploaded from South Korea on March 4 th, 2022.
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