罗小娟, 王静, 黄晓霞, 吕才芳, 陈敏玫, 唐梅荣, 何为涛, 陆皓泉, 廖敏, 黎沙, 林玫, 钟革. 广西钦州市一起由奥密克戎BA.2变异株引起的新型冠状病毒肺炎本土疫情流行病学特征[J]. 疾病监测, 2023, 38(1): 118-123. DOI: 10.3784/jbjc.202206220292
引用本文: 罗小娟, 王静, 黄晓霞, 吕才芳, 陈敏玫, 唐梅荣, 何为涛, 陆皓泉, 廖敏, 黎沙, 林玫, 钟革. 广西钦州市一起由奥密克戎BA.2变异株引起的新型冠状病毒肺炎本土疫情流行病学特征[J]. 疾病监测, 2023, 38(1): 118-123. DOI: 10.3784/jbjc.202206220292
Luo Xiaojuan, Wang Jing, Huang Xiaoxia, Lyu Caifang, Chen Minmei, Tang Meirong, He Weitao, Lu Haoquan, Liao Min, Li Sha, Lin Mei, Zhong Ge. Epidemiological characteristics of a local COVID-19 outbreak caused by Omicron variant (BA.2) in Qinzhou, Guangxi[J]. Disease Surveillance, 2023, 38(1): 118-123. DOI: 10.3784/jbjc.202206220292
Citation: Luo Xiaojuan, Wang Jing, Huang Xiaoxia, Lyu Caifang, Chen Minmei, Tang Meirong, He Weitao, Lu Haoquan, Liao Min, Li Sha, Lin Mei, Zhong Ge. Epidemiological characteristics of a local COVID-19 outbreak caused by Omicron variant (BA.2) in Qinzhou, Guangxi[J]. Disease Surveillance, 2023, 38(1): 118-123. DOI: 10.3784/jbjc.202206220292

广西钦州市一起由奥密克戎BA.2变异株引起的新型冠状病毒肺炎本土疫情流行病学特征

Epidemiological characteristics of a local COVID-19 outbreak caused by Omicron variant (BA.2) in Qinzhou, Guangxi

  • 摘要:
      目的  分析广西钦州市一起本地聚集性新型冠状病毒肺炎(COVID-19)疫情的调查处置过程和流行病学特征, 为今后的COVID-19疫情防控工作提供参考。
      方法  收集本起疫情病例流行病学和临床表现信息、实验室检测结果和专题分析报告,采用描述性流行病学方法进行分析。
      结果  本起COVID-19疫情自2022年3月12—24日共持续13 d,报告感染者97例。 男性49例,女性48例;年龄中位数MP25P75)为32岁(17,44.5);无症状感染者79例,确诊病例18例。 潜伏期中位数为3 d,潜隐期中位数为2 d。 共排查出密接3841人,61人转为感染者,密接续发率1.59%。 明确家庭内传播的疫情共8起,家庭续发率为65%(95%CI:20%~100%);涉及3起大规模聚集性疫情:娱乐会所包厢内聚集、婚礼聚餐、新居宴聚餐,罹患率分别为63.64%、9.38%、12.16%。 疫情首先在娱乐会所包厢内暴发,最长的传播链至少传至5代。 病毒基因测序显示为奥密克戎BA.2变异株。
      结论  通过对一起新型冠状病毒奥密克戎BA.2变异株引起的聚集性疫情分析发现,早期采取措施对控制疫情有重要意义。

     

    Abstract:
      Objective  To analyze the epidemiological characteristics of a local COVID-19 outbreak in Qinzhou, Guangxi Zhuang autonomous region, and provide reference for the prevention and control of COVID-19 in the future.
      Methods  The epidemiological and clinical information, analysis reports and laboratory test results of the COVID-19 cases were collected for a descriptive epidemiological analysis.
      Results  A total of 97 COVID-19 cases, including 79 asymptomatic cases and 18 confirmed cases, were reported in Qinzhou during 12−24 March, 2022. Forty nine cases were males and 48 cases were females. The median of age of the cases was 32 (17.0, 44.5) years. The median of incubation period was 3 days. The median of latent period was 2 days. A total of 3841 close contacts were screened, in whom 61 were infected. The secondary attack rates in 3841 close contacts was 1.59%. The secondary attack rate in household contacts was 65% in 8 family clustering (95% CL: 20%−100%). Three mass gathering were identified in a local recreation center box, a wedding ceremony and a family feast for new home, in which the attack rates were 63.64%, 9.38% and 12.16%, respectively. Transmission firstly occurred in the people attending the activity in the recreation center box. At least 5 generations of transmission were identified in the outbreak. The results of genome second generation sequencing of the isolates from 20 infection cases revealed that the pathogen of the outbreak was SARS-CoV-2 Omicron variant (BA.2).
      Conclusion  Analysis on the cases caused by Omicron variant (BA.2) indicated early prevention measures are important for the control of further spread of COVID-19.

     

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