There were already seven cases of untreatable viral pneumonia on Dec 30, 2019 at the Wuhan Central Hospital, according to now deceased Dr. Li Wenliang.
By Jan 23, 2020 830 confirmed cases and an unknown number of clinically diagnosable cases had piled up, at which time Wuhan in Hubei province was locked down.
Much too late.
From the CNBC update:
China’s railway operator said 210 million trips were taken in the 40
days of the Lunar New Year travel period from Jan. 10 to Feb. 18, state
news agency Xinhua reported. That number marked a 48% decline from last year.
During roughly the first two weeks of the travel period, through Jan.
24 (Lunar New Year eve), 168 million trips were taken, an increase of
17.2% from the corresponding holiday travel season last year, the report
said. For the remainder of the time period, rail trips fell 83.9%, the
article said. The report noted the number of average daily trips during
the latter period fell to 1.7 million from 11.2 million. — Cheng