Omicron mutant. The asymptomatic infected strains reported in Ji 'an province are all Omicron mutants, which are highly concealed and contagious. Long-distance return home will increase the risk of cross-infection and spread of the virus. Ji 'an epidemic virus is a variant of Omicron. Ji 'an is a prefecture-level city in Jiangxi Province. It was called Luling and Jizhou in ancient times; At the beginning of the Yuan Dynasty, it was renamed Ji 'an from the meaning of "Ji Tai's daughter". There is a Buddhist holy land-Qingyuan Mountain, which has produced the Zen Sect of Qingyuan, so it is famous at home and abroad.