Fighting Omicron epidemic in China: Real-world big data from Fangcang shelter hospital during the outbreak in Shanghai 2022

A recent letter published in your journal by Yuan et al. summarized the measures being taken in China to effectively contain COVID-19 epidemics including the recent Omicron outbreak in Shanghai.1 Omicron has a reproduction number (R0)>10, and causes relatively mild symptoms, both of which aggravate the rapid spread of the virus in a “stealth mode”. Shanghai faces especially severe challenges to control the outbreak at minimal social and economic costs, considering it is a major metropolis with a population of 25 million.