英文文章地址：https://www.nejm.org/doi/full/10.1056/NEJMoa2001316（Clinical features of patients infected with 2019 novel coronavirus in Wuhan, China（《中国武汉地区2019年新型冠状病毒感染者的临床特征》）
初步总结：
  1）2020/01/18号，修订了判定了疑似病例的判定条件：发病前14日之内，有去武汉的旅行史，或者接触（direct contact）过武汉有发烧或呼吸症状的病人。
The epidemiologic criteria to define a suspected case were updated on January 18, 2020, once new information on identified cases became available. The criteria were the following: a travel history to Wuhan or direct contact with patients from Wuhan who had fever or respiratory symptoms, within 14 days before illness onset.

  2)2020/01/19号，在中国另一省报告了一例确证病例，有武汉旅行史。
First confirmed case reported in another province in Chine (in a person who had traveled from Wuhan); China CDC issued test reagent(测试试剂) to all provinces in China
  3）论文总结：从425个病例分析，2019年12月中开始出现人际（close contact）之间的传播.
On the basis of this information, there is evidence that human-to-human transmission has occurred among close contacts since the middle of December 2019.

  疑问？？？：
  1）医护人员什么时间发现感染的，在2020/01/18之前还是之后。文章分析的425个病例有医护人员吗？文章没有明确说，但读文章，感觉病例中应该有医护人员。
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修改:naifen FROM 23.99.125.*
FROM 23.99.125.*