The epidemic of 2019-novel-coronavirus(2019-nCoV) has become a global pandemic since the outbreak at the end of 2019. With the deep understanding of characteristics and disease spectrum of 2019-nCoV, new concepts relevant to 2019-nCoV infection are also emerging, some even overturned people's previous understanding of infectious diseases. Combined with the current advance, this paper interprets people concerned hot topics of 2019-nCoV infection.