首页|新冠病毒Delta变异株在农贸市场传播的流行病学特征分析

新冠病毒Delta变异株在农贸市场传播的流行病学特征分析

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目的 调查新冠病毒Delta变异株疫情在农贸市场内传播的流行病学特征,为人群聚集性场所Delta变异株引起的新型冠状病毒感染疫情防控提供科学依据.方法 描述性分析新型冠状病毒感染疫情的流行病学特征,估算病例的潜伏期以及实际再生系数.结果 2021年12月7-20日,该起疫情累计发现新型冠状病毒感染确诊病例122例和无症状感染者104例,平均年龄49.53岁,最大88岁,最小1岁;男女性别比为0.74∶1;职业以个体摊贩(30.97%)和家庭主妇(16.81%)为主;波及9个乡镇/街道,主要集中在曹娥街道(82.30%)和百官街道(5.75%).该次疫情新冠病毒感染者的中位潜伏期为4 d(范围2~12 d).疫情高峰时实际再生系数为4.6,此后呈不断下降趋势,在疫情发生后13 d内降至1以下.疫情依次在个体摊贩、顾客和顾客家人中传播,疫情自发现后13 d(12月7-20日)单日发病人数下降为0,主要的发现方式为集中隔离(45.13%)和居家隔离(39.38%)的人群筛查.结论 新冠病毒Delta变异株在农贸市场人群中快速传播,提示须快速排查隔离风险人群阻止疫情传播扩散.
Epidemiological characteristics of transmission of SARS-CoV-2 Delta variant in a farmers'market
Objective To investigate the epidemiological features of spread of SARS-CoV-2 Delta variant in a farmers'market so as to provide a scientific basis for prevention and control of the epidemic caused by SARS-CoV-2 Delta variant in the people-gathering places.Methods Descriptive epidemiological methods were used to describe the epidemiological characteristics of the SARS-CoV-2 epidemic.The incubation period of the cases and time-varying reproduction numbers were estimated and calculated.Results From December 7 to 20,2021,a total of 122 confirmed cases of SARS-CoV-2 infection and 104 asymptomatic infected persons were cumulatively identified in the epidemic.The average age was 49.53 years old,and the ratio of male to female was 0.74∶1.The occupations of the cases were mainly individual vendors(30.97%)and housewives(16.81%).9 townships/streets were involved in the epidemic,mainly occurring in Caoe Street(82.30%)and Baiguan Street(5.75%).The median incubation period of SARS-CoV-2 among the cases in the epidemic was 4 days(with a range of 2-12 days).The time-varying reproduction number was 4.6 during the peak period of the epidemic,and then showed a constantly downward trend,declining to below 1 within 13 days after the occurrence of the epidemic.The epidemic spread in turn among individual vendors,customers and customers'families.The number of SARS-CoV-2 infection cases decreased to 0 within 13 days(from December 7 to 20)since the discovery of the local outbreak,and the main discovery methods were population screenings based on centralized quarantine(45.13%)and self-quarantine at home(39.38%).Conclusion SARS-CoV-2 Delta variant spread very fast in the farmers'market,suggesting that we should quickly identify and isolate the risk population so as to control the spread of the epidemic.

SARS-CoV-2Delta variantepidemiological characteristicfarmers'market

方益荣、马岩、王吉玲、蒋国钦、马珊珊、徐来潮

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绍兴市疾病预防控制中心,浙江 绍兴 312000

新型冠状病毒 Delta变异株 流行病学特征 农贸市场

2024

实用预防医学
中华预防医学会 湖南省预防医学会

实用预防医学

CSTPCD
影响因子:1.391
ISSN:1006-3110
年,卷(期):2024.31(1)
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