Source: China – South China Morning PostThe southern Chinese city of Shenzhen is on high alert, with a fourth locally acquired Covid-19 case found during routine screening.The new infections are the first cases of community transmission reported in the city since an outbreak in May 2020.The Shenzhen Health Commission on Monday said all four cases were linked but the source of the infection was unknown.It said a married couple tested positive for the Delta variant on Friday, followed by a colleague of the woman on Saturday. Another…Read More