A staff member takes a swab sample from a woman for nucleic acid test in Huangpu District, east China's Shanghai, May 8, 2022. Shanghai has set up fixed and mobile acid testing sites in areas such as residential communities, office spaces, business parks and in the vicinities of subway and other public transport stations in accordance with the epidemic situation.Photo:Xinhua

 
The gene sequencing results show the viruses that caused rapid spread in the latest outbreak in Shanghai since March 1 are Omicron's BA.2 and BA.2.2 mutations, and no new variants have been found: local authorities on Wed