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Description:Aug.28 -- Johns Hopkins Bloomberg School of Public Health Professor and Virologist Andrew Pekosz discusses the U.S. Centers for Disease Control and Prevention’s shift in guidance on Covid-19 testing, coronavirus reinfections in Hong Kong and Europe, and the impact of the return of children to schools on transmission rates. He speaks with Bloomberg’s Anna Edwards 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.