COURTESY BY: https://www.hindustantimes.com/ The new cluster of Covid-19 infections in Beijing could have begun a month earlier than thought, a top infection expert has said as the capital on Thursday recorded 21 new cases, increasing the caseload to 158 in a week with nearly all the infections linked to a sprawling fresh food market in the southwestern Fengtai district. Gao Fu, the director of the Chinese Centre for Disease Control and Prevention (CDC), said the outbreak probably did not occur in early June or late May, but probably a month…