（3）12月31日凌晨，国家卫生健康委作出安排部署，派出工作组、专家组赶赴武汉市，指导做好疫情处置工作，开展现场调查。武汉市卫生健康委在官方网站发布《关于当前我市肺炎疫情的情况通报》，发现27例病例，提示公众尽量避免到封闭、空气不流通的公众场合和人多集中地方，外出可佩戴口罩。当日起，武汉市卫生健康委依法发布疫情信息。

　　（4）2020年1月1日，国家卫生健康委成立疫情应对处置领导小组。1月2日，国家卫生健康委制定《不明原因的病毒性肺炎防控“三早”方案》；中国疾控中心、中国医学科学院收到湖北省送检的第一批4例病例标本，即开展病原鉴定。

(3) December 31: The NHC made arrangements in the small hours to send a working group and an expert team to Wuhan to guide its response to the situation and conduct on-site investigations.

The WCHC website carried its Information Circular on the Pneumonia Cases in Wuhan, confirming 27 cases and urging the public to stay away from enclosed public places with poor ventilation and venues where large crowds gathered. The commission also suggested the use of face masks when going out. From that day on, the WCHC began to release updates on the disease in accordance with the law.

(4) January 1, 2020: The NHC set up a leading group on the disease response. The next day, it formulated Guidelines on Early Detection, Early Diagnosis and Early Quarantine for Prevention and Control of Viral Pneumonia of Unknown Cause. The Chinese Center for Disease Control and Prevention (China CDC) and the Chinese Academy of Medical Sciences (CAMS) received the first batch of samples of four cases discovered in Hubei and began the pathogen identification process.

　　（5）1月3日，武汉市卫生健康委在官方网站发布《关于不明原因的病毒性肺炎情况通报》，共发现44例不明原因的病毒性肺炎病例。国家卫生健康委组织中国疾控中心等4家科研单位对病例样本进行实验室平行检测，进一步开展病原鉴定。国家卫生健康委会同湖北省卫生健康委制定《不明原因的病毒性肺炎诊疗方案（试行）》等9个文件。当日起，中国有关方面定期向世界卫生组织、有关国家和地区组织以及中国港澳台地区及时主动通报疫情信息。

　　（6）1月4日，中国疾控中心负责人与美国疾控中心负责人通电话，介绍疫情有关情况，双方同意就信息沟通和技术协作保持密切联系。国家卫生健康委会同湖北省卫生健康部门制定《不明原因的病毒性肺炎医疗救治工作手册》。

(5)January 3: The WCHC issued Information Circular on Viral Pneumonia of Unknown Cause, reporting a total of 44 cases.

Under the direction of the NHC, China CDC and three other institutions carried out parallel laboratory testing of the samples to identify the pathogen. The NHC and the Health Commission of Hubei Province jointly formulated nine documents, including Diagnosis and Treatment Protocol for Viral Pneumonia of Unknown Cause (for Trial Implementation).

From that day on, on a regular basis, China began to update the WHO, relevant countries, and regional organizations, as well as its own regions of Hong Kong, Macao and Taiwan, on the development of the disease.

(6)January 4: The head of China CDC held a telephone conversation with the director of the US CDC, briefing him about the new pneumonia. The two sides agreed to keep in close contact on information sharing and cooperation on technical matters.

The NHC and related health departments in Hubei Province produced Treatment Manual for Viral Pneumonia of Unknown Cause.

　　（7）1月5日，武汉市卫生健康委在官方网站发布《关于不明原因的病毒性肺炎情况通报》，共发现59例不明原因的病毒性肺炎病例，根据实验室检测结果，排除流感、禽流感、腺病毒、传染性非典型性肺炎和中东呼吸综合征等呼吸道病原。中国向世界卫生组织通报疫情信息。世界卫生组织首次就中国武汉出现的不明原因肺炎病例进行通报。

　　（8）1月6日，国家卫生健康委在全国卫生健康工作会议上通报武汉市不明原因肺炎有关情况，要求加强监测、分析和研判，及时做好疫情处置。

(7)January 5: The WCHC updated information on its website, reporting a total of 59 cases of the viral pneumonia of unknown cause. Laboratory tests ruled out respiratory pathogens as the cause, such as influenza, avian influenza, adenovirus, the Severe Acute Respiratory Syndrome coronavirus, and the Middle East Respiratory Syndrome coronavirus.

China sent a situation update to the WHO. The WHO released its first briefing on cases of pneumonia of unknown cause in Wuhan.

(8)January 6: The NHC gave a briefing on cases of pneumonia of unknown cause in Wuhan at a national health conference, calling for greater efforts to monitor, analyze and study them, and prepare for a timely response.

　　（9）1月7日，中共中央总书记习近平在主持召开中共中央政治局常务委员会会议时，对做好不明原因肺炎疫情防控工作提出要求。

　　（10）1月7日，中国疾控中心成功分离新型冠状病毒毒株。

　　（11）1月8日，国家卫生健康委专家评估组初步确认新冠病毒为疫情病原。中美两国疾控中心负责人通电话，讨论双方技术交流合作事宜。

(9)January 7: Xi Jinping, general secretary of the CPC Central Committee, presided over a meeting of the Standing Committee of the Political Bureau of the CPC Central Committee and issued instructions on the prevention and control of a possible epidemic of the pneumonia of unknown cause in Wuhan.

(10)January 7: China CDC succeeded in isolating the first novel coronavirus strain.

(11)January 8: An expert evaluation team designated by the NHC initially identified a new coronavirus as the cause of the disease. The heads of the China and US CDCs held a telephone discussion on technical exchanges and cooperation.

　　（12）1月9日，国家卫生健康委专家评估组对外发布武汉市不明原因的病毒性肺炎病原信息，病原体初步判断为新型冠状病毒。中国向世界卫生组织通报疫情信息，将病原学鉴定取得的初步进展分享给世界卫生组织。世界卫生组织网站发布关于中国武汉聚集性肺炎病例的声明，表示在短时间内初步鉴定出新型冠状病毒是一项显著成就。

　　（13）1月10日，中国疾控中心、中国科学院武汉病毒研究所等专业机构初步研发出检测试剂盒，武汉市立即组织对在院收治的所有相关病例进行排查。国家卫生健康委、中国疾控中心负责人分别与世界卫生组织负责人就疫情应对处置工作通话，交流有关信息。

(12)January 9: The NHC expert evaluation team released information on the pathogen of the viral pneumonia of unknown cause, and made a preliminary judgment that a new coronavirus was the cause.

China informed the WHO of developments and the initial progress that had been made in determining the cause of the viral pneumonia. The WHO released on its website a statement regarding a cluster of pneumonia cases in Wuhan, indicating that the preliminary identification of a novel coronavirus in such a short period of time was a notable achievement.

(13)January 10: Research institutions including China CDC and the Wuhan Institute of Virology (WIV) under the Chinese Academy of Sciences (CAS) came up with an initial version of test kits. Wuhan immediately began to test all relevant cases admitted to local hospitals to screen for the new coronavirus.

The heads of the NHC and China CDC held separate telephone conversations with the head of the WHO about China’s response to the disease, and exchanged information.