FRANKFURT (Reuters) - Central bankers must change course to fight accelerating inflation, Deutsche Bank Chief Executive Officer Christian Sewing said on Monday. Sewing, speaking at a banking conference, said he didn’t share the opinion of central bankers that inflation increases were temporary. “I think monetary policy must take countermeasures here - and sooner rather than later,” Sewing said. “The supposed panacea of recent years - low interest rates with seemingly stable prices - has lost its effect, and now we are struggling with the side effects,” he said. Reporting by Tom Sims and Frank Siebelt; Editing by Paul Carrel