A survey showed U.S. firms in China are lowering revenue projections amid Beijing’s stringent Covid Zero strategy. Enda Curran reports. China is tightening pandemic restrictions in Shanghai and expanding a mass testing sweep in Beijing as officials chase the elusive goal of wiping out Covid-19 cases in the community. The country reported 3,426 new infections for Monday, the lowest daily tally since March 16. Cases in Shanghai, where the biggest outbreak remains underway, fell to a six-week low of 3,014 after peaking at more than 27,000 a day in mid-April. In Beijing, new infections rose to 74, though they have yet to exceed 100-a-day in the current flare-up. Despite the low numbers, authorities are ramping up curbs. Some Shanghai neighborhoods have announced “quiet periods,” where residents aren’t allowed to go outside and deliveries are curbed, while more people are being shipped off to government-run isolation centers under […]