Acknowledgements
We thank Dr Ben Hu at Wuhan Institute of Virology, Chinese Academy of Sciences, Wuhan, China for phylogenetic analysis of 2019-nCoV S gene.

Disclosure statement
No potential conflict of interest was reported by the author(s).

ORCID
Shibo Jiang http://orcid.org/0000-0001-8283-7135
Lanying Du http://orcid.org/0000-0001-5955-1294
Zhengli Shi http://orcid.org/0000-0001-8089-163X