Update: US covid case rise

Data suggests many more Americans have been travelling over the past few days than did this time last year, but there's been a sharp rise in Covid-19 cases in recent weeks. Scientists are warning the United States could be entering a fifth wave of infections and as hospitals are getting busier, we hear from Eric Topol, a physician scientist at Scripps Research in California. Plus, Sir John Tusa tells us where power lies at top of a firm; is it with the executive team that runs the business day in, day out, or is it the board at the very top?