On May 7, it was reported from the network circle that "a new (novel coronavirus) mutant strain appeared in Shanghai, and the transmission speed increased by 30%". In this regard, the Shanghai Center for Disease Control and Prevention said that at present, Shanghai continues to carry out gene sequencing of novel coronavirus samples. The sequencing results show that the virus genotyping of infected people reported in the recent local epidemic in Shanghai is mainly Omicron ba 2 and ba 2.2 mutant. At present, no new mutant with stronger transmission power has been found. (outlook new era)