世界卫生组织发布新冠疫情应对完整时间线

世界卫生组织公布了其应对新冠肺炎疫情的详细时间线，记录了从疫情初现到全球疫苗推广的关键节点。1WHO驻华办事处于2019年12月31日首次获悉武汉出现不明原因肺炎病例，中国当局随后于2020年1月9日确认疫情由新型冠状病毒引起。1WHO在2020年1月30日宣布新冠肺炎构成国际关注的突发公共卫生事件，并于3月11日正式将其定性为大流行。1

在应对机制方面，WHO建立了多层次的国际合作框架。12020年4月，该组织启动了获取COVID-19工具加速器（ACT-Accelerator），同时OpenWHO平台的课程注册人数超过480万，涵盖44种语言和25门课程。1在疫苗开发协调上，截至2021年1月26日，WHO全球疫苗候选物清单列出63个临床开发中的候选疫苗和173个临床前开发候选物。1

COVAX疫苗便利机制是全球应对的重要支柱。1该机制于2020年7月15日获得超过150个国家支持，代表全球人口60%以上，并自2021年2月22日起向92个低收入和中等收入国家提供疫苗。1至2021年4月10日，COVAX已向100多个经济体提供疫苗，在42天内交付超过3800万剂。1

The World Health Organization published a detailed chronology documenting its response to the COVID-19 pandemic from the initial detection of the outbreak through April 2021, outlining critical milestones and coordinated global efforts 1.

The WHO office in China first learned of pneumonia cases of unknown origin in Wuhan on December 31, 2019 1. Chinese authorities confirmed on January 9, 2020, that the outbreak was caused by a novel coronavirus 1. The organization declared COVID-19 a Public Health Emergency of International Concern (PHEIC) on January 30, 2020 1, and subsequently characterized it as a pandemic on March 11, 2020 1.

Throughout its response, WHO established multiple mechanisms to coordinate international action. By April 2020, the OpenWHO platform had registered more than 4.8 million course participants across 44 languages and 25 courses 1. The organization launched the Access to COVID-19 Tools Accelerator (ACT-Accelerator) on April 24, 2020 1, and by July 15, 2020, the COVAX vaccine facility had secured support from more than 150 countries representing over 60 percent of the global population 1. As of January 26, 2021, WHO's global vaccine candidate list identified 63 vaccine candidates in clinical development and 173 in preclinical development 1. COVAX began delivering vaccines to 92 low- and middle-income countries on February 22, 2021 1, and by April 10, 2021, had supplied vaccines to more than 100 economies, delivering over 38 million doses within 42 days 1.