How does the outbreak of 2019-nCoV spread in mainland China? A retrospective analysis of the dynamic transmission routes

Xiandeng Jiang; Le Chang; Yanlin Shi

To combat against the rapid spread of the 2019-nCoV, since mid-January 2020, the central government of China and all local governments have implemented intensive preventions. Examples include tracing close contacts and quarantining infected cases, promoting social consensus on self-protection like wearing face mask in public area, among others [13] . With the unexpectedly rapidly growing number of confirmed cases, more extreme and unprecedented measures have taken places. On 23 January, the Chinese authorities introduced travel restrictions on five cities (Wuhan, Huanggang, Ezhou, Chibi and Zhijiang) of Hubei, shutting down the movement of more than 40 million people [14] . Among existing research, most argues that those interventions have effectively halted the spread of the 2019-nCoV [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] .