Dr. Anthony Fauci and Dr. Deborah Birx, two key members of the White House coronavirus task force, have warned nine major cities across the country over their high COVID-19 testing positivity rates. Birx, coordinator of the White House task force, first raised concerns about the high positivity rates in Atlanta; Baltimore; Boston; Chicago; Detroit; Kansas City, Missouri; Portland, Oregon; Omaha, Nebraska; and Washington, D.C.; in a Wednesday call with state and local officials.