human coronaviruses, four of them, including NL-63, 229E, HKU1 and OC43, cause mild illness, while the other three, SARS-CoV, MERS-CoV and 2019-nCoV, lead to serious disease [2]. To characterize the new pathogen causing acute infection in humans, researchers have conducted urgent studies on the 2019-nCoV, from its epidemiol