Department of Infectious Diseases, Tokyo Metropolitan Bokutoh General Hospital, Tokyo, Japan.
Field Epidemiology Training Program, National Institute of Infectious Diseases, Tokyo, Japan.
Western Pac Surveill Response J. 2022 Mar 24;13(1):1-5. doi: 10.5365/wpsar.2022.13.1.906. eCollection 2022 Jan-Mar.
Coronavirus disease 2019 (COVID-19), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), was first reported in China and subsequently spread worldwide. In Japan, many clusters occurred during the first wave in 2020. We describe the investigation of an early outbreak in a Tokyo hospital.
A COVID-19 outbreak occurred in two wards of the hospital from April to early May 2020. Confirmed cases were individuals with laboratory-confirmed SARS-CoV-2 infection linked to Wards A and B, and contacts were patients or workers in Wards A or B 2 weeks before the index cases developed symptoms. All contacts were tested, and cases were interviewed to determine the likely route of infection and inform the development of countermeasures to curb transmission.
There were 518 contacts, comprising 472 health-care workers (HCWs) and 46 patients, of whom 517 were tested. SARS-CoV-2 infection was confirmed in 42 individuals (30 HCWs and 12 patients). The proportions of SARS-CoV-2 infections in HCWs were highest among surgeons, nurses, nursing assistants and medical assistants. Several HCWs in these groups reported being in close proximity to one another while not wearing medical masks. Among HCWs, infection was thought to be associated with the use of a small break room and conference room.
Nosocomial SARS-CoV-2 infections occurred in two wards of a Tokyo hospital, affecting HCWs and patients. Not wearing masks was considered a key risk factor for infection during this outbreak; masks are now a mandated countermeasure to prevent the spread of SARS-CoV-2 infection in hospital settings.
由严重急性呼吸系统综合征冠状病毒 2 型（SARS-CoV-2）引起的 2019 年冠状病毒病（COVID-19）最初在中国报告，随后在全球范围内传播。在日本，2020 年第一波疫情期间发生了许多集群。我们描述了对东京一家医院早期疫情的调查。
2020 年 4 月至 5 月初，该医院的两个病房发生了 COVID-19 疫情。确诊病例为与 A 病房和 B 病房相关的实验室确诊 SARS-CoV-2 感染个体，接触者为 A 病房或 B 病房的患者或工作人员，在确诊病例出现症状前 2 周。对所有接触者进行了检测，并对病例进行了访谈，以确定可能的感染途径，并为遏制传播制定对策提供信息。
共有 518 名接触者，包括 472 名医护人员（HCWs）和 46 名患者，其中 517 人接受了检测。有 42 人（30 名 HCWs 和 12 名患者）确诊感染了 SARS-CoV-2。外科医生、护士、护理助理和医疗助理等组别的 SARS-CoV-2 感染比例最高。这些组别的一些 HCWs 在不戴口罩的情况下彼此近距离接触。在 HCWs 中，感染被认为与使用小休息室和会议室有关。
东京一家医院的两个病房发生了医院获得性 SARS-CoV-2 感染，影响了 HCWs 和患者。不戴口罩被认为是此次疫情感染的一个关键危险因素；现在，口罩是防止 SARS-CoV-2 感染在医院环境中传播的强制性措施。
