Centre for Health Protection, Department of Health, Hong Kong SAR (China).
Western Pac Surveill Response J. 2020 Nov 13;11(4):36-40. doi: 10.5365/wpsar.2020.11.1.012. eCollection 2020 Oct-Dec.
An outbreak of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was first reported in Wuhan, China, in December 2019, with subsequent spread around the world. Hong Kong Special Administrative Region SAR (China) recorded its first confirmed cases on 23 January 2020. In this report, we describe a family cluster of 12 confirmed cases, with two additional confirmed cases from secondary transmission.
We reported the epidemiological, clinical and laboratory findings of the family cluster, as well as the public health measures instituted.
All 12 confirmed COVID-19 cases were among the 19 attendees of a three-hour Chinese New Year family dinner consisting of hotpot and barbecue dishes. Environmental sampling of the gathering venue was negative. Two additional confirmed cases, who were co-workers of two confirmed cases, were later identified, indicating secondary transmission. Contact tracing, quarantine and environmental disinfection were instituted to contain further spread.
Our findings were highly suggestive of a superspreading event during the family gathering. The source was likely one of the cases during the pre-symptomatic phase. The event attested to the high infectivity of SARS-CoV-2 through human-to-human transmission from social activities and argued for the necessity of social distancing in curtailing the disease spread.
由严重急性呼吸综合征冠状病毒 2（SARS-CoV-2）引起的 2019 年冠状病毒病（COVID-19）疫情于 2019 年 12 月在中国武汉首次报告，随后在全球范围内传播。中国香港特别行政区（SAR）于 2020 年 1 月 23 日记录了首例确诊病例。在本报告中，我们描述了一个家庭聚集性 12 例确诊病例，以及两例继发传播的确诊病例。
我们报告了家庭聚集性的流行病学、临床和实验室发现，以及实施的公共卫生措施。
所有 12 例确诊的 COVID-19 病例均来自一次持续三小时的中国新年家庭聚餐的 19 位与会者，聚餐包括火锅和烧烤菜肴。聚会场所的环境采样结果为阴性。随后又发现了两例确诊病例，他们是两例确诊病例的同事，表明存在继发传播。实施了接触者追踪、隔离和环境消毒，以遏制进一步传播。
我们的发现高度提示家庭聚会期间发生了超级传播事件。源头可能是无症状阶段的病例之一。该事件证明了 SARS-CoV-2 通过社交活动的人际传播具有高度传染性，并证明了社交距离在遏制疾病传播方面的必要性。
