Genetic analysis of a SARS-CoV-2 Omicron variant from a Chinese traveller returning from overseas oleh Hongling Jia, Hui Wang, Lan Cao, Zhisheng Lai, Zichun Cheng, Qingpei Chen, Tongzheng Liu, Xiangyi Liu, Yanting Wen, Conghui Xu, Weizhi Lu, Guang Yang, Deqian Zhou, Biao Di, Feng Gao, Zhicong Yang