across the city, adding to a shortage of labour. the number of covid cases has not been confirmed, but according to an informal survey by chinese search engine baidu, 70% of beijing, a city of 22 million people, is infected. meanwhile, in china s largest city, shanghai, they started counting asymptomatic cases. also, some antigen tests not associated with laboratory. they are just done at home. just like the issues we have been having with antigen test, you don t have that situation or awareness. 0ur antigen test, you don t have that situation or awareness. our best bet is to understand what is happening in the hospital. meanwhile, in china s largest city, shanghai, officials have ordered most schools to take classes online as covid cases soar. nurseries and childcare centres will close from monday, according to the education bureau. the authorities have stepped up vaccinations,