The 2019-nCov epidemic has become a common concern of the international community. Since the first infection was diagnosed in Wuhan in December 2019, the novel coronavirus has been spreading at a speed even beyond the expectation of medical experts. In response, the Chinese government mandated a quarantine of the Wuhan city on January 23, 2020; 31 provinces and municipalities, including Beijing and Shanghai, have also taken measures on first-level response to this major public health emergency.