Sep.18 -- Johns Hopkins Bloomberg School of Public Health Professor and Virologist Andrew Pekosz discusses the ebb and flow of covid-19 in the United States as the nation nears 200,000 virus deaths and steps to try to avoid a second wave of infections. He speaks with Bloomberg’s Francine Lacqua on “Bloomberg Surveillance.” The Bloomberg School of Public Health is supported by Michael R. Bloomberg, founder and majority owner of Bloomberg LP, the parent company of Bloomberg News.