(Bloomberg) — South Korea reported its biggest spike in new coronavirus cases in nearly two months, raising concerns about a second wave of infections. Small clusters also emerged in several locations in Japan in its first week since the emergency was lifted.Cases continued to soar in Brazil and America reached the grim milestone of 100,000 deaths, the most in the world. The U.K.’s coronavirus tracing program was hit by technical problems on the day of its launch, with some health-care workers unable to log-on to the system.Roche’s immune suppressor Actemra will be paired with Gilead’s antiviral remdesivir in a late-stage […]