The World Health Organization reported infections are down globally. In the last two weeks, new cases in the U.S. have decreased by more than 60 percent and a number of states and cities have been lifting masking requirements. But experts warn about letting our guard down too soon. Dr. Anthony Fauci, chief medical adviser to President Biden, joins Judy Woodruff to discuss. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders