MMWR Morb Mortal Wkly Rep. 2022 Feb 18;71(7):243-248. doi: 10.15585/mmwr.mm7107a4.
During November 19-21, 2021, an indoor convention (event) in New York City (NYC), was attended by approximately 53,000 persons from 52 U.S. jurisdictions and 30 foreign countries. In-person registration for the event began on November 18, 2021. The venue was equipped with high efficiency particulate air (HEPA) filtration, and attendees were required to wear a mask indoors and have documented receipt of at least 1 dose of a COVID-19 vaccine.* On December 2, 2021, the Minnesota Department of Health reported the first case of community-acquired COVID-19 in the United States caused by the SARS-CoV-2 B.1.1.529 (Omicron) variant in a person who had attended the event (1). CDC collaborated with state and local health departments to assess event-associated COVID-19 cases and potential exposures among U.S.-based attendees using data from COVID-19 surveillance systems and an anonymous online attendee survey. Among 34,541 attendees with available contact information, surveillance data identified test results for 4,560, including 119 (2.6%) persons from 16 jurisdictions with positive SARS-CoV-2 test results. Most (4,041 [95.2%]), survey respondents reported always wearing a mask while indoors at the event. Compared with test-negative respondents, test-positive respondents were more likely to report attending bars, karaoke, or nightclubs, and eating or drinking indoors near others for at least 15 minutes. Among 4,560 attendees who received testing, evidence of widespread transmission during the event was not identified. Genomic sequencing of 20 specimens identified the SARS-CoV-2 B.1.617.2 (Delta) variant (AY.25 and AY.103 sublineages) in 15 (75%) cases, and the Omicron variant (BA.1 sublineage) in five (25%) cases. These findings reinforce the importance of implementing multiple, simultaneous prevention measures, such as ensuring up-to-date vaccination, mask use, physical distancing, and improved ventilation in limiting SARS-CoV-2 transmission, during large, indoor events..
2021 年 11 月 19 日至 21 日，在纽约市举行了一次室内会议（活动），约有来自美国 52 个司法管辖区和 30 个外国的 53000 人参加。该活动于 2021 年 11 月 18 日开始现场注册。该场地配备了高效微粒空气（HEPA）过滤器，要求与会者在室内戴口罩，并提供至少 1 剂 COVID-19 疫苗的接种记录。*2021 年 12 月 2 日，明尼苏达州卫生部门报告了美国首例社区获得性 COVID-19 病例，该病例是由参加该活动的人携带的 SARS-CoV-2 B.1.1.529（Omicron）变异株引起的（1）。CDC 与州和地方卫生部门合作，利用 COVID-19 监测系统和匿名在线与会者调查的数据，评估与该事件相关的 COVID-19 病例和美国与会者的潜在接触情况。在有可用联系方式的 34541 名与会者中，监测数据确定了 4560 人的检测结果，其中 16 个司法管辖区的 119 人（2.6%）的 SARS-CoV-2 检测结果呈阳性。大多数（4041[95.2%]），调查答复者报告说，在活动室内始终戴着口罩。与检测阴性的答复者相比，检测阳性的答复者更有可能报告参加酒吧、卡拉 OK 或夜总会，以及在室内与他人至少 15 分钟进食或饮水。在接受检测的 4560 名与会者中，没有发现活动期间广泛传播的证据。对 20 个样本的基因组测序在 15 个病例（75%）中发现了 SARS-CoV-2 B.1.617.2（Delta）变异株（AY.25 和 AY.103 亚系），在 5 个病例（25%）中发现了 Omicron 变异株（BA.1 亚系）。这些发现强调了在大型室内活动中实施多种同时预防措施的重要性，例如确保及时接种疫苗、戴口罩、保持身体距离和改善通风，以限制 SARS-CoV-2 的传播。
