[1] Story behind the sudden spike of confirmed cases in Hubei Province.
https://www.bbc.com/zhongwen/trad/chinese-news-51485553
[2] Official amendment of the numbers in Hubei Province. The day before, the newly confirmed cases reported in the Hubei Province was 349, while that of Wuhan city was 615 (Wuhan is a city in Hubei).
http://m.news.cctv.com/2020/02/21/ARTI5BVxbRm6O6rOBnUVpaMB20...