December 29, 2020 China News Hong Kong fourth wave: more than 50 Covid-19 cases expected, sewage monitoring system raises hope for new policies Source: scmp.com Key Topics in this News Article: ChinaCoronavirusCovid-19Hong Kong News Snapshot: Pilot scheme picked up sustained traces of the coronavirus in a housing block for the first time, prompting mandatory testing. View Original Full News → News Timeline:Track the development of related news across the Internet. Timeline is being generated. Please check back and refresh this page soon.